PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 19 
Measurements in millimeters and hundredths of length of carapaz. 
Station— 
871 879 874 | 1125 | 1038 | 940 | 1043 | 1043 
DE AC BERR SSr ee 5 SOLA aeRO BCS ane epee Yng.| Yng.| cy. o oe o g 
Length of carapax, including frontal teeth..| 8.9 9.8} 13.3] 21.7] 23.2) 29.8) 26.3) 35.5 
Length of carapax, excluding frontal teeth .| 8.6 9.5) 12.8) 21.0) 22.4] 28.7] 25.7 | 34.0 
Breadth of carapax in front of lateralspines.| 10.3 | 11.5 | 15.8 | 26.2] 28.0] 37.0| 314) 42.7 
Same in hundredths of length first given -.-.| 116. 117. 119. 121. 121. 124. 119. 120. 
Breadth of carapax, including lateral spines.| 16.2 | 17.0} 24.2 |) 40.8] 43.8 | 56.0) 46.0) 65.0 
Length of Jateral spines ..................-- 3.3 3.0 5.0 8.7 9.3 | 10.8 7.3 | 12.0 
Length of right cheliped...........-.--..--. 14.0} 15.0] 21.0.) 35.0] 39.0] 53.0) 44.0] 60.0 
LEE TPR OICCLYG) Fe Ae Bs perc Dec Eso oce Seabees ant 8.0 | 11.3] 19.0) 21.3 | 285) 23.6) 32.0 
Pee ne OM ONOlararsab fesceasan one =\=sec07-s =e 2.7 2.9 3.8 6.7 7.9] 10.3 83] 12.0 
PEG MUM OGMACGVLUS -iocin cca csscise cecescade aes 3.7 3.8 6.0 9.0) 10.7) 14.38] 12.0] 16.8 
Length of left cheliped.........-.....--.---. MSEo |) Wao |e SsOMtess. 0) poe saee 51.0°| 42.5] 57.0 
eno ORHAN. oa--\sosastecodasce=-eesaces 7.5 7.6 OSH, W823) keene 27.5 | 23.0 | 31.0 
DELETE ADIGE LLG) I Se A ee ee 2.5 2.8 2.5 CEU ie Sac ne OL et |antOag 
Geneth omdaciylns) 2... - eos abeccececanee 3.7 4.0 6.7 Ones see nL aa ge Ue Lr AC) 
Length of third ambulatory leg. -..-...-..-- 22.0] 25.0} 35.0] 52.0] 60.0] 72.5] 64.0) 75.0 
Length of fourth ambulatory leg...-.-...--- 14.0] 15.0] 21.0] 33.0] 38.5| 46.5) 41.0] 55.0 
Men euendachylnG =~. -)-— -wcccsaasaccsconss 4.4 4:6) \/teacisstc C2 oy i fa fa USA VE es Beal ay 
Breadthot dactylus: ...2-. 525.2 --+-2..-52-- 1.2 TEARS oo 3.7 4.3 5.4 5.0 7.0 
OXYSTOMATA. 
Acanthocarpus Alexandri Stimpson. 
Although this species occurred in considerable abundance in the 
dredgings off Martha’s Vineyard in 1880, being taken at seven out of the 
fourteen stations in between 50 and 200 fathoms, it was taken but once 
in 1881, station 944, 128 fathoms, and was not taken at all in 1882. 
In the living specimens taken in 1881 the dorsal surface of the carapax 
and chelipeds was pale reddish orange, deepest in color upon the eleva- 
tions of the carapax and upon the bases of the carpal spines of the 
cbelipeds; while the carapax beneath, the sternum, abdomen, and the 
under surfaces of the chelipeds and ambulatory legs were white, very 
slightly tinged with reddish. 
Myropsis quinquespinosa Stimpson, Bull. Mus. Comp. Zool. Cambridge, ii, p. 157, 
1870 ; A. M.-Edwards, ibid., viii, p. 21, 1880. 
Station 941, N. lat. 40° 1’, W. long. 69° 56’. 
A single very large male, which gives the following measurements : 
Millimeters. 
Length of carapax, including frontal lobes and posterior spine....-..---.------ 37.0 
Length of carapax, excluding frontal lobes and posterior spine ......--..-.-.-- 34. 0 
Breadth of carapax, including lateral tubercles..-.-.--...----..----.---------- 31.4 
Breadth of carapax, excluding lateral tubercles...............--.-------------- 31.0 
UMMC HO INCU psc e te ace ences ak sa cae ster ese emesis eee sas sete kee sete 75. 0 
ce les eION UE te ss S253 38 Se NEL DLE SU 5k tees SS Se Pee S255 
[LETS Faye PE MD eS eee ee ae ee eS Fy en aS re aS eae 34.8 
RM ERICA RMS oo 21h Said ag wadiSuig bain ous vin Gtle Sew beet oni beeuiwetin dlp - 21.0 
ECL SMTSU ADI RUOTY LOD. on anion ss nin wna nde wen sep kst sacnn= -0n os packs 56. 0 
SPHERE OL DOSUCLION AMPULSGOTYOL --- cccced sas ceeicien ascens snwcusicetcuc cosoes 36. 0 
In life the dorsal surface of the carapax and the chelipeds and ambu- 
latory legs are pale orange red. 
