. ( ;..

■•■-.- .' .1; ;

BULLETIN

OF THE

MUSEUM OF COMPARATIVE ZOOLOGY

▲T

HARVARD COLLEGE, IN CAMBRIDGE.

VOL. X.

CAMBRIDGE, MASS., U. S. A 1882-1883.

Reprinted with the permission of the original publisher

KRAUS REPRINT CORPORATION

New York

1967

Printed in U.S.A.

CONTENTS.

Page No. 1. — Eeports on the Results of Dredging by the United States Coast

Survey Steamer "Blake." XVII. Report on the Crustacea. Parti. De-

capoda. By S. I. Smith. (16 Plates) 1

No. 2. — Bibliography to accompany " Selections from Embryological Mono- graphs," compiled by A. Agassiz, W. Faxon, and E. L. Mark. II. Echinodermata. By A. Agassiz 109

No. 3. — On a Revision of the Ethmoid Bone in the Mammalia. By H. Allen. (7 Plates) 135

No. 4. — Reports on the Results of Dredging by the United States Coast Survey Steamer " Blake." XVIII. The Stolked Crinoids of the Caribbean Sea. By P. H. Carpentee 165

No. 5. — Reports on the Results of Dredging by the United States Coast Survey Steamer " Blake." XIX. Report on the Fishes. By G. B. Goode and T. H. Bean 183

No. 6. — Reports on the Results of Dredging by the United States Coast Sur- , vey Steamer " Blake." XX. Report on the Ophiuroidea. By T. Ltman. (8 Plates) 227

No. 1. — Reports on the Results of Dredging, under the Supervision of Alexander Agassiz, on the East Coast of the United States, during the Summer of 1S80, by the U. S. Coast Survey Steamer "Blake" Commander J. E. Bartlett, U. S. N., Commanding.

(Published by peiiuission of Carlile P. Patterson and J. E. Hilgakd, Supts.

U. S. Coast and Geodetic Survey.)

XVII. Report on the Crustacea. Part I. Decapoda. By Sidney I. Smith.

The part of the following report relating to the Maci-ura was ready for the printer before Alphonse Milne-Edwards's Description de quelques Crustac'es Macroures provenant des grandes profondeurs de la Mer des Antilles (Annsdes Sci. Nat., Zool., 6°" serie, XL No. 4, 1881) was received, so that all the references to it have been added subsequently. The new species in this and some other recent papers of Milne- Edwai'ds, and in Bates's recent paper on the Penaeidea, are so inoperfectly characterized that in several cases I have found it impossible to determine, with any approximation to certainty, whether or not they are identical with species described in the following pages. I have endeavored, however, to make the descriptions and figures of the species here described so complete, that subsequent investigators will not labor under a similar difficulty in regard to them.

BRACHYURA.

MAIOIDEA. Amathia Agassizii, sp. nov.

Plate II. Figs. 2, 3.

Resembles A. Carpentcri Norman (figured by Wyville Thomson, Depths of the Sea, p. 175, 1873), but has shorter rostral horns and more numerous spines upon the carapax.

The carapax Ip sub-triangular, excluding spines and rostral horns, nearly

VOL. X. — NO. 1. 1

2 BULLETIN OF THE

four fifths as broad as long, or with the breadth including spines about equal to the length excluding the rostral horns, which are strongly divergent, nearly straight, and in the adult less than half as long as the rest of the carapax. The supra-orbital spines are large, acute, and much more prominent than the obtuse post-orbital processes. The basal segment of the antenna is armed with two large and nearly equal spines beneath the eye, one near the base, the other near the tip. The hepatic region projects above the lateral margin in a promi- nent spine about a third of the way from the orbit to the great branchial spine. The anterior angles of the buccal area project in angular dentiform processes, back of which the prominent margin of the pleural region is armed with two or three small and unequal spines. There are six spines or spiniform tuber- cles on the gastric region, two median, and each side two slightly smaller lateral, which are nearer together than the median. There are three median spiniform tubercles on the cardiac region, of which the middle one is much the more prominent, and back of these the posterior margin of the cardiac region projects in a prominent median spine, either side of which the postero-lateral margin is ornamented with a regular series of six or seven minute tubercles. The middle of the branchial region projects in a spine directed straight out- ward and a little upward, which is the largest upon the carapax, and about half as long as the rostral horns ; on a line between this and the postero-lateral gastric spine there are two spines near together ; and back of these on the posterior part of the region there is a single spine opposite the large cardiac spine. In addition to these dorsal spines of the branchial region there is a lateral closely set series of three or four small spines just below the pleural suture and above the base of the cheliped, and a similar but isolated spine below and back of the great branchial spine. The entire surface of the cara- pax and of the sternum, and of the exposed parts of the appendages, except the terminal portions of the chelae and of the dactyli of the ambulatory legs, is covered with soft scabrous papillae, and sparsely clothed with short setce.

The chelipeds are a little longer than the carapax including the rostral horns, and scarcely stouter than the ambulatory legs ; the chela is nearly as long as and no stouter than the merus, the basal portion subcylindrical, nearly naked and smooth except for minute, scattered papillae, like those on the surface generally except that they are smaller and much more scattered ; the digits are a little more than half as "long as the basal portion, a little curved, slightly com- pressed, smooth, and with the prehensile edges regularly dentate. The ambula- tory legs are all armed with a dentiform spine at tlie distal end of the merus ; the first pair are nearly twice as long as the chelipeds, and the succeeding pairs are successively a little shorter.

The second and third segments of the abdomen of the male are expanded, and tlie first ami second are each armed with a small median tubercle.

Station 319, N. Lat. 32° 25', W. Long. 77° 42' 30", 262 fath. ; 1 ^.

A very much smaller specimen (Plate II. fig. 3) from Station 317 differs so much from the one above described that it might readily be n)istaken for a dis- tinct species. It is apparently an immature male, and diflers in having a

MUSEUM OF COMPARATIVE ZOOLOGY. 3

narrower carapax, with much longer rostral horns and fewer and much longer spines.

The carapax, excluding the rostral horns and lateral spines, is about two thirds as broad as long ; the rostral horns are as long as the breadth of the car- apax excluding the spines, nearly straight, slender, and very acute. There are two spines upon the basal segment of the antenna, but the proximal is much smaller than the distal. The hepatic spine is slender, and about a fourth as long as the rostral horns. There is only one small spine, or one with the rudi- ment of a second, on the margin of the pleural region back of the anterior angle of the buccal area. The two median spines of the gastric region are slender and conspicuous, the posterior much the larger, but there are no lateral spines. The middle spine of the cardiac region is as long as the hepatic, and in front of its base there is a rudiment of a second ; the posterior cardiac spine is slender and very little shorter than the hepatic, but there are no spines or tubercles either side its base. The middle spine of the branchial region is slender, and more than half as long as the rostral horns ; there is a single small spine in place of the two anterior branchial ; a small posterior branchial is present ; and in place of the series of small spines there are two very minute tubercles.

The chelipeds and ambulatory legs are nearly as in the other specimen, but the chelae and the dactyli of the ambulatory legs are a little more hairy.

Station 317, N. Lat. 31° 57', W. Long. 78° 18' 35", 333 fath.

The two specimens give the following measurements. ^

Station 319 317

Sex $ Young

Length of carapax including rostrum and posterior spine 35.2 mm 13.1 mm. Length of carapax from base of rostrum to tip of pos- terior spine 27.5 8.4

Length of rostral horns 8.5 5.1

Breadth of carapax, including lateral spines . . . 27.0 10.5

" " excluding « « . . 20.3 5.1

Length of branchial spine 4.5 3.0

" cheliped 37 8

" first ambulatory leg 63 16

" second " . ^ . . . . 43 13

Since the above was written several specimens of this species have been taken oflF Martha's Vineyard by the United States Fish Commission. All these speci- mens are intermediate in size between those above described, and show that they are really, as supposed, stages of growth of a single species.

Hyas coarctatus Leach.

One young specimen, Station 301, N. Lat. 41° 26' 55", W. Lon. 66° 3', 71 fath.

4 BULLETIN OF THE

Euprognatha rastellifera Stimpson.

Stimpson, Bull. Mus. Comp. ZooL, H. p. 123, 1870.

A. M. -Edwards, Crust. Region Mexicaine, p. 183, PI. XXXIH. fig. 2, 1878 ; Bull.

Mus. Comp. Zobl., VIIL p. 7, 1880. Smith, Proc. National Mus., Washington, IIL p. 415, 1881.

Station. N. Lat. W. Long. Fathoms. Specimens.

335 38° 22' 25" 73° 33' 40" 89 1 <?.

345 40° 10' 15" TI'' 4' 30" 71 70^?.

346 40° 25' 35" 71° 10' 30" 44 1?.

This is apparently by far the most abundant of all the Brachyura along om whole eastern coast south of Cape Cod in the belt from 50 to 200 fath. depth. Ill the U. S. Fish Commission dredgings off Martha's Vineyard, many thou- sands of specimens were often taken at a single haul of the trawL

CANCROIDA.

Cancer irroratus Sat.

Cancer irroratus Sat, Jour, Acad. Nat. Sci. Philadelphia, I. p. 59 (d" only, ? being C. borealis), PI. IV. fig. 2, 1817.

Stimpson, Ann. Lyceum Nat. Hist. New York, VII. p. 50 (4), 1859.

Smith, Trans. Conn. Acad., V. p. 38, 1879.

KiNGSLEY, Proc. Acad. Nat. ScL, 1879, p. 391, 1880. Plahjcarcinus irroratus M. -Edwards, Hist. Nat. Crust., I. p. 414, 1834.

DeKat, Nat. Hist. New York, Crust., p. 6 (in part), PI. II. fig. 2, 1844. Cancer Sayi Gould, Invertebrata Massachusetts, 1st ed., p. 323, 1841. Flatycardnus Sayi DeKay, op. cit., p. 7, 1844. Cancer borealis Packard, Memoirs Boston Soc. Nat. Hist., I. p. 303, 1867.

Station.	N. Lat.	W. Long.	Fathoms.	Specimena.
314	32<»24' 0"	78= 44 0"	142	29.
327	34° 0' 30"	76° 10' 30"	178	6<?-,2?
333	35° 45' 25"	74° 50' 30"	65	1^.

The occurrence of this abundant shallow-water and littoral northern species in deep water south of Cape Hatteras is very interesting. As a littoral species it is apparently not abundant south of Cape Hatteras, and on the New England coast fully grown individuals are certainly rare below twenty fathoms. The alcoholic specimens from deep water are lighter in color than similar specimens from shallow water, but this may be partially due to the fact that they are entirely devoid of all algoid growths which are common on shallow-water individuals ; and the edges of the carapax appear more acutely dentated, which is easily explained by the fact that they are not subjected to the abrading in- fluence of sand and gravel as the shallow- water specimens are. The following measurements show no appreciable difference from shallow-water specimens in the proportions of the carapax.,

MUSEUM OF COMPARATIVE ZOOLOGY.

Length of Carapax.	Breadth of Carapax.
25.0 mm.	38.7 mm.	= 1.55 Igth,
36.3	56.0	1.54
37.2	59.0	1.59
37.2	59.1	1.59
40.5	64.8	1.60
41.0	64.8	1.58
59.7	94.0	1.59
39.0	61.5	1.58
39.1	62.0	1.56

Station. Sex.

333 $ 327 '*

U ((

(( ((

« ((

(c u

u li

9

Cancer borealis Stimpson.

Cancer irroratus Say, Jour. Acad. Nat. Sci. Philadelphia, I. p. 57, 1817 (? only, d" being C. irroratus). Gould, Invertebrata Massachusetts, 1st ed., p. 322, 1841 Stimpson, Invertebrata Grand Manan, p. 59, 1853 {teste Stimpson). Platijcarcinus irroratus J)kK AY, Nat. Hist. New York, Crust., p. 6 (but not the

fig.), 1844. Cancer borealis Stimpson, Ann. Lyceum Nat. Hist. New York, VII., p. 54(4), 1859. Smith, Inverteb. Vineyard Sd., Report U. S. Fish Com., I. pp. 546 (252), 745 (451), 1874 ; Trans. Conn. Acad., V. p. 39, PI. VIII. 1879 ; Proc. National Mus., Washington, III. p. 417, 1881. KiNGSLEY, Proc. Acad. Nat. Sci. Philadelphia, 1878, p. 317 (2).

Station.	N	•. Lai	t.	W.	Long.	Fathoms.	Specimens.
314	32°	24'	0"	78°	44' 0"	142	Ic?,	39,	3 young.
321	32°	43'	25"	77°	20' 30"	233	6c?,	49.
327	34°	0'	30"	7G°	U/ 30"	178	3(?,	19,	8 young.
Fifteen of the	specimens	give the following	measurements.
station.			Sex.	Lengtli of Carapax.	Breadth of Carapax.
314		Y	oung.		15.2 mm.		21.5 mm. =	: 1.41 Igth.
((			((		16.7		24.3		1.45
321			9		22.3		33.2		1.48
((			»	-	■ 25.3		38.0		1.50
327			tt		47.0		73.0		1.55
314			IC		49.3		76.0		1.54
321			<?		32.5		49.0		1.51
((			((		38.0		59.5		1.56
31 i			«		46.0		72.0		1.56
327			»		47.0		74.5		1.59
321			((		47.6		75.5		1.59
327			((		63.0		101.2		1.60
((			((		76.0		120.0		1.58
314			((		78.0		123.0		1.58
((			((		80.0		129.0		1.61

6 BULLETIN OF THE

This species has also heen taken in considerable abundance, in 50 to 200 fathoms, off Martha's Vineyard, by the U. S. Fish Commission. The remarks under the last species in regard to coloration, acuteness of the dentation of the edge of the carapax, etc., apply equally well to this species. The fact that this species and C. irroratus as well are regular inhabitants of the deep water off our southern coast is sufficient to account for their occasional occurrence in shallow water at the Bermudas, and even in the West Indies.

Cancer Bellianus Johnson (Proc. Zool. Soc. London, 1861, p. 240, PI. XXVIII.) from Madeira, is much like this species, but apparently distinct from it.

Geryon quinquedens Smith.

Trans. Conn. Acad., V. p. 35, PI. IX. figs. 1-1 b, 2, 1879 ; Proc. National Mus.

Washington, III. p. 417, 1881.

Station.	N. Lat.	W. Long.	Fathoms.	Specimens.
325	33° 35' 20"	76° 0' 0"	647	1^
332	35° 45' 30"	740 48' 0"	263	2^
334	38° 20' 30"	73° 26' 40"	395	2<?
337	38° 20' 8"	73° 23' 20"	740	Fragments only.
343	39° 45' 40"	70° 55' 0"	732	3 9 with eggs.
309	40° 11' 40"	68° 22' 0"	304	1^,1? "
312	39° 50' 45"	70° 11' 0"	466	1(?

These specimens and others recently obtained by the U. S. Fish Commission show that this species groAvs to be one of the largest of the Brachyura. The very large individuals differ considerably from the specimens originally de- scribed. In all the large specimens the teeth of the antero-lateral margin of the carapax become reduced to angular tubercles, and in some of the larger ones the fourth tooth becomes entirely obsolete. Thus in specimens No. 2, 3, 5, 7, and 8 of the table of measurements given below, the fourth tooth is distinct ; in No. 9, distinct, but very obtuse ; in No. 4, distinct, but the right side of the carapax deformed by some injury ; in No. 1, nearly obsolete ; while in Nos. 6 and 10 it is entirely obsolete.

Ten specimens give the following measurements : —

No. station. Sex. Length of Carapax. Breadth including spines. Breadth excluding spines.

1 312 ^ 41.0 mm. 51.6 mm. = 1.26 Igth. 45 mm. = 1.10 Igth.

2 309 " 54.0 65.5

3 334 " 81.0 97.0

4 " " 94.0 113.0

5 3.32 " 116.0 136.5

6 " " 130.0 152.5

7 309 9 47.5 61.0

8 343 " 82.5 99.5

9 " " 84.0 100.0 10 « " 92.0 107.5

1.21	61	1.13
1.20	89	1.10
1.20	104	1.11
1.18	128	1.10
1.17	144	1.11
1.28	55	1.16
1.21	92	1.12
1.19	91	1.18
1.17	101	1.10

MUSEUM OF COMPAEATIVE ZOOLOGY. 7

In four of the above specimens the greatest expanse of the ambulatory legs, which is at next to the last pair, is a.s follows. No. 5, 540 mm. ; No. 6, 625 mm. (24.6 inches) ; No. 8, 380 mm. ; No. 10, 417 mm. The chelae are almost ex- actly alike on the two sides, and in the largest male and largest female give the following measurements : —

	Right Chela.		Left Chela..
	Length. Height. Length of Dactylus.	Length.	Height. Length of Dactylus.
No. 6	114 mm. 42 62	112	38 62
" 10	68 25 39	68	23 38

OXYSTOMATA.

CALAPPID-SJ.

Acanthocarpus Alexandri Stimpson.

Stimpson, Bull. Mus. Comp. Zool., II. p. 153, 1870. A. M.-Edwards, Ibid., VIII. p. 19, PI. I. fig. 2, 1880. Smith, Proc. National. Mus., Washington, III. p. 418, 1881.

Station 345, N.Lat. 40° 10' 15", W. Long. 71° 4' 30", 71 fathoms. A single male recently moulted and very soft, the carapax about 36.0 mm. long and 36.1 broad. It has also been taken at several stations off Martha's Vineyard by the U. S. Fish Commission in 1880 and 1881, and in living specimens from these stations the dorsal surface of the carapax and chelipeds was pale reddish orange, deepest in color upon the elevations of the carapax and upon the bases of the carpal spines of the chelipeds ; while the carapax beneath, the sternum, abdomen, and the under surfiices of the chelipeds and ambulatory legs are white, very slightly tinged with reddish.

DORIPPID-ffi.

Cyclodorippe nitida A. M.-Edwards.

Bull. Mus. Comp. Zool., VIII. p. 24, 1880. Plate II. Figs. 1 - 1\

Station 319, N. Lat. 32° 25', W. Long. 77° 42' 30", 262 fath. One speci- men, which gives the following measurements : —

Station 319

Sex 9

Length of carapax to middle of front 6.1mm.

" " including frontal teeth 6.4

Breadth between tips of lateral teeth 6.9

Greatest breadth back of lateral teeth 6.9

Length of cheliped 10.0

8 BULLETIN OF THE

Length of chela 5.0 mm.

Breadth of " 1.7

Length of its dactyliis 2.8

" first ambulatory leg 9.0

" dactylus 2.0

" second ambulatory leg 11.6

" dactylus 3.2

" telson 2.5

Breadth of " 4.8

ANOMURA.

LITHODIDEA.

Lithodes Agassizii, sp. nor.

Plate I.

This species is allied to L. maia and L. antarctica in having no scale and only a single spine at the base of the antenna, and in the general form and armament of the carapax and appendages, but differs from them both con- spicuously in the rostrum, which is rather short and tridentate, with the lateral spines nearly as long as the rostral spine itself. The spines upon the carapax and appendages are more numerous and much more acute than in L. maia, and the marginal spines of the carapax are not very much larger than the dorsal. There are only two adults, both females, in the collection, and these differ remarkably from each other, and from three very young specimens, in the number and length of the spines upon the carapax and legs.

In the larger specimen the carapax, excluding the rostrum and spines, is about nine tenths as broad as long, with a conspicuous sinus in the middle of the posterior margin. The rostrum is very short, with an acute central spine scarcely as long as the eye-stalks and with a somewhat shorter lateral spine arising either side its base and directed upward and outward. The gastric region is swollen and very high, separated from the cardiac by a very deep depression, and armed with a pair of small spines just back of the lateral spines of the rostrum, and back of these on the highest part of the region with two widely separated pairs of much larger spines, while either side there is a small spine opposite the large hepatic spine, between which and the obtusely spiniform external angle of the orbit there are two spinigerous angular promi- nences in the antero-lateral margin. There is a distinct notch in the antero- lateral margin at the cervical suture, but back of this the margin is regularly arcuate to the middle of the posterior margin, and is armed with about thirteen stout spines, of which the larger are about as large as the hepatic spines. The branchial region is considerably convex, and armed, in addition to those upon the margin, with about ten large spines, between which there are a consider-

MUSEUM OF COMPARATIVE ZOOLOGY. 9

able number of low obtuse spines or tubercles. The cardiac region is separated from the branchial each side by a deep sulcus, is prominent and armed with two pairs of large spines, and back of these with a single one in the middle line.

The eyes, antennulte, antennae, and the exposed parts of the oral appendages are very nearly as in L. maia. The chelipeds are nearly equal in length, but the right is much stouter than the left, are armed with comparatively few and small spines, and the digits of the chelae are about two thirds of the entire length of the chela, slender, tapering, and strongly curved. The ambulatory legs are very long, those of the third pair being nearly three times as long as the breadth of the carapax excluding spines. The ischial, meral, and carpal segments are armed with only a very few scattered and very small spines, the meral segments in the first and second pairs are almost entirely unarmed ex- cept a few small spines or teeth along the upper edges, but the propodi, which are slender and fully as long as the corresponding meri, are armed along the edges with more numerous and very sharp but small spines. The dactyli are about half to considerably more than half the length of the corresponding pro- podi, slightly curved, acute, and, except near the tips, armed with small and acute spines.

The plates of the second somite of the abdomen are armed with numerous spines projecting backward ajid upward, and of which those upon the middle plate are longer than those upon the lateral. The plates of the succeeding somites of the abdomen are very unequally developed, the plates of the left hand side of the third, fourth, and fifth somites being greatlj' developed at the expense of the corresponding plates of the opposite side, so that the outer edge of the left side of the fifth segment lies beneath the bases of the cheliped and first ambulatory leg of the right side, and the small semicircular telson is beneath or a very little in front of the base of the second ambulatory leg of the right side.

In the smaller of the adult specimens (PI. I. fig. 1) the carapax, excluding rostrum and spines, is proportionally narrower than in the larger specimen, being about eight tenths as broad as long, and the spines upon the carapax, abdomen, and appendages are much longer and more numerous, the additional spines appearing between the large ones corresponding to the spines, or in place of the tubercles, on the larger specimen. The rostral spine and the spines at its base are absolutely more than twice as long as in the larger speci- men and more slender, and about the same proportion holds for all the principal spines of the carapax. The external angle of the orbit projects in a spine but little shorter than the eye-stalk, and back of it there are two nearly as large spines on the antero-lateral margin in place of the two angular prominences of the larger specimen. The large hepatic spine and the thirteen large marginal spines back of the cervical suture are most of them but little smaller than the rostral spine, are directed more upward than oiitward, and there are nearly as many more additional smaller spines alternating with the larger. There is a conspicuous additional spine in the middle of the gastric region, and numerous additional small spines on other parts of the carapax.

10 BULLETIN OF THE

The chelipeds and ambulatory legs have about the same proportions as in the larger specimen, but are armed with very numerous acute spines, many of which are of large size. The spines upon the second somite of the abdomen are more numerous, and the larger ones much longer and more slender than in the larger specimen.

The small specimens are all immature, with the carapax excluding the rostrum and spines less than 13 mm. in length, and differ so much from the adults that they might readily be mistaken for a distinct species. These small specimens differ considerably in size, but are all essentially alike. The smallest and most perfect one is from the U. S. Fish Commission dredgings off Martha's Vineyard. In this specimen (PI. I. figs. 2, 2») the carapax excluding the rostrum and spines is only 12.6 mm. in length and scarcely more than seven tenths as broad as long, but all three of the rostral spines and several spines of the carapax proper are more than half as long as the carapax. The spines are nmch fewer in number than in either of the adult specimens, very slender and acute, and those at the base of the rostrum are just about as large as the rostrum itself. The gastric region is proportionally very much larger than in the adults, but is high and separated from the cardiac region by a deep sulcus, as in them, and is armed with six slender spines, — two pairs on the highest part of the region, of which the anterior pair are almost as long as the rostrum, but the posterior considerably shorter, and a still smaller lateral spine each side. There are two pairs of slender spines on the anterior part of the cardiac region, the anterior a little longer and the posterior a little shorter than the posterior gastric spines. The single hepatic spine each side is nearly as long as the rostrum. The external angle? of the orbit projects forward in a long and slen- der spine, back of which are two smaller spines on the antero-lateral margin. There are about twelve slender spines on the lateral and posterior margin back of the cervical suture each side, but they are all small compared with the other spines of the carapax and about half of them are inconspicuous, and above these on either branchial region there are six much larger spines, of which two near the middle of the region are as long as the posterior gastric, but the others considerably shorter.

The eye-stalks and eyes are small and proportionally but little larger than in the adult, but there are two or three sharp spines projecting in front over the eye in place of some inconspicuous tubercles in the adults. The anten- nulse, antennae, and the exposed parts of the oral appendages, are nearly as in the adults.

The chelipeds are nearly as unequal as in the adults, and are armed with very much longer and more slender spines, several of those upon the distal part of the merus and upon the carpus being longer than the carpus itself The ambulatory legs have about the same proportions as in the adults, but the spines with which they are armed are fully as long as those upon the chelipeds, the longer 'ones, as in the chelipeds, being upon the distal parts of the meri and upon the carpi.

The abdomen is symmetrical. The second somite is made up of three calci-

MUSEUM OF COMPARATIVE ZOOLOGY.

11

fied and spiny plates, nearly as in the adult female. The third, fourth, and fifth somites are soft, scarcely at aU calcified, and show no distinct division into somites. The sixth is small and sunken for its whole length in the proximal somites, while the seventh is still smaller and rounded at the ex- tremity.

Four of the five specimens seen give the following measurements : —

((

Station 1029

Sex Young.

Length of carapax including rostrum and posterior

spines ........ 17.5

Length of carapax excluding rostrum and posterior spines .....

Brea,dth of carapax between tips of hepatic spines,

" " " ■ " branchial

Greatest breadth of carapax excluding spines Length of rostrum ....

spines at base of rostrum . anterior gastric spines .

" " cardiac

" right cheliped

« " chela ....

Breadth of ""•... Length of dactylus of right chela

" left cheliped

" " chela ....

Breadth of " ....

Length of dactylus of left chela

" first ambulatory leg

** second " « ^ _

« third " "...

Greatest expanse of ambulatory legs

305 329

Young. 9

326

9

25+ 115 139

Statiou. 305 326 329

N. Lat. 41° 33' 15". 33° 42' 15" 34° 39' 40"

9.1	12.6	DO	123
oines, 13.5	18+	57	64
spines, 13.0	18+	87	117
. 6.6	9.0	77	110
7.3	9+	17	8
. 7.4	11.5	16	7
7.0	10.5	12	5
. 6.3	8.0	10	5
. 15.0	19.0	126	171
. 6.1	8.5	55	66
1.9	2.5	18	25
. 3.5	5.0	35	. 44
. 15.0	20.0	126	167
. 6.0	8.8	50	62
1.5	1.9	14	19
. 3.8	5.5	36	44+
18.5	30.0	220	270
. 19.5	31.5	245	310
19.5	32.0	260	320
. 43.0	65.0	560	720
W. Long.		Fathoms.
65° 51' 25"		810
76° 0' 50"		464
75° 14' 40"		603

Also taken by the U. S. Fish Commission, ofl' Martha's Vineyard, in 1881, Stations 1028 and 1029, 410 and 458 fathoms ; one young specimen in each case.

12 BULLETIN OF THE

PAGURIDBA.

PAGUBID^.

Eupagurus Kroyeri Stimpson.

Eupagurus Kroyeri Stimpson, Ann. Lyceum Nat. Hist. New York, VIL p. 89 (43),

1859. Smith, Trans. Conn. Acad., IH. p. 28, 1874 ; Ibid., V. p. 48 ; Proc. National

Mus., Washington, IIL p. 428, 1881. Eupagurus pubcscens Kkoyer, in Gaimard, Voyages en Scandinavie, PI. II. fig. 1,

1849 (non Kroyer, Naturli. Tidssk., 11. p. 251, 1839).

Station.	N. Lat.	W. Long.	Fathoms.	Specimens.
303	41° 34' 30"	65° 54' 30"	306	6
306	41° 32' 50"	65° 55' 0"	524	4
311	39° 59' 30"	70° 12' 0"	143	2 in Epizoanthiis.

Nearly all the specimens I have seen from deep water off the Southern coast of New England are smjiU, and the great majority of them were inhabiting carcinoecia overgrown by or composed of Epizoanthus Americanus Verrill.

Eupagurus politus, sp. nov.

Plate II. Fig. 5.

The carapax is not suddenly narrowed at the bases of the antennae, where the breadth is eqvial to the length in front of the cervical suture, and not ros- trated, the median lobe of the front being broadly rounded and not projecting as far forward as the external angles of the orbital sinuses, which are acute and each usually armed with a short spine.

The eye-stalks, including the eyes, are nearly four fifths as long as the breadth of the carapax in front, stout, and expanded at the very large black eyes, which are terminal, not oblique, compressed vertically, and broader tlian half the length of the stalks. The ophthalmic scales are small, narrow, and spiniform at the tips.

The peduncle of the antenna is about as long as the breadth of the carapax in front, and the ultimate segment about a third longer than the penultimate. The upper flagellum is much longer than the ultimate segment of the pe- duncle, while the lower is only about half as long as the upper, slender, and composed of ten to twelve segments. The peduncle of the antenna reaches slightly beyond the eye. The acicle is slender, slightly curved, and reaches to the ti]) of the peduncle, and inside its base there is a minute tooth, while outside there is a straight spine toothed or spined along its inner edge, acute at the tip and half as long as the acicle itself. The flagellum is nearly naked, and about three times as long as the carapax.

MUSEUM OF COMPAEATIVE ZOOLOGY. 13

The exposed parts of the oral appendages are very nearly as in E. hernhardus.

The chelipeds are longer, much narrower, and more nearly equal in size than in E. hernhardus, and, as in that species, are almost entirely naked, hut beset with numerous tubercles and low spines. The right cheliped is about as long as the body from the front of the carapax to the tip of the abdomen. The merus and carpus are subequal in length, while the chela is about' once and a half as long as the carpus. The carpus and chela are rounded above and armed with numerous tubercles, which are smaller and more crowded on the chela than on the carpus, but the surface between the tubercles is smooth and polished. The dorsal surface of the carpus is limited along the inner edge by a sharp angle armed with a double line of tubercles, while the outer edge is rounded. The chela is very little wider than the carpus, and is narrowed from near the base to the tips of the digits, and both edges are rounded. The digits are rather slender, about half as long as the entire chela, slightly gaping, with acute and strongly incurved chitinous tips, and the prehensile edges armed with a very few obtuse tuberculiform teeth. The left chela is much more slender than the right, but reaches to or a little by the base of its dactylus. The carpus is slender, higher than broad, only slightly expanded distally, and with the narrow dorsal surface flattened and margined either side with a single line of spiniform tubercles. The chela is about a third longer than the carpus, slender, about two and a half times as long as broad, and the dactylus about two thirds the entire length. The dorsal and outer surface is tuberculose, and a low obtuse ridge extends from near the middle of the base along the pro- podal digit, which tapers from the base to the tip, while the dactylus is smooth except for a few fascicles of setae, more slender than the propodal digit, and tapered only near the tip. The chitinous tips of the digits are slender, acute, and strongly incurved, and the prehensile edges are sharp, and armed with a closely set series of slender spines or setae.

The ambulatory legs reach considerably beyond the right cheliped, and the second pair reach to the tips of the first pair. In both pairs the nieri and pro- podi are approximately equal in length and longer than the carpi, while the dactyli are about once and a half as long as the propodi, slender, strongly curved, and distally strongly twisted. The two posterior pairs of thoracic legs and the abdominal appendages are very nearly as in E. hernhardus.

In life the general color of the exposed parts is pale orange, the tips of the chelae and of the ambulatory legs white, the eyes black.

The eggs are very large, and few in number as compared with the ordinary species of the genus, being 1.0 to 1.1 mm. in diameter in alcoholic specimens, while in E. hernhardus they are only 0.45 to 0.50 mm. in diameter.

Three specimens give the following measurements : —

Station 306 309 309

Sex 9 $ $

Length from front of carapax to tip of abdomen 25.0 mm. 40.0 mm. 50.0 mm. " of carapax along median line . .10.0 16.0 21.0

14

BULLETIN OF THE

Breadth of carapax in front				5.5 mm. 8.6 mm. 11.0mm
Length of eye-stalks			.	4.7	6.2	7.8
Greatest diameter of eye				2.7	3.5	4.1
Length of right cheliped			•	30.0	40.0	56.0
" carpus			•	7.3	11.3	14.5
chela			•	12.0	16.0	22.7
Breadth of chela				6.8	8.3	11.0
Length of dactylus ,			*	6.1	9.1	11.9
" left cheliped			,	25.0	37.0	48.0
" carpus			•	6.1	10.0	12.0
" chela .			•	9.2	13.5	17.5
Breadth of chela			•	4.0	5.8	7.5
Length of dactylus			.	5.8	8.8	11.2
'* first ambulatory leg,	right side			36.0		67.0
" propodus .	, ,		•	7.6		14.5
" dactylus .	. •		,	11.5		22.0
" second ambulatory leg, right side		38.0	54.0	73.0
" propodus .	• • «		•	8.8	12.0	16.0
" dactylus	•	•	•	13.0	17.0	23.0
station. N. Lat.	w.	Long	•		Fathoms.	Specimens.
309 40° 11' 40"	68°	22'	0"		304	3
310 39° 59' 16"	70°	18'	30"		260	2
336 38° 21' 50"	73°	32'	0"		197	5

It has also been taken, and in great abundance, by the U. S. Fish Commis- sion, oflf Martha's Vineyard and off the Capes of the Delaware, in 65 to 365 fathoms, and is the species which I have referred to, in Proc. National Mus., Washington, III. p. 428, 1881, as " Euvagurus, sp."