PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 15 
The specimens taken in 1881 are much smaller than the type speci- 
mens taken in 1880; none of the females are fully adult, and the largest 
males, though adult, are apparently not fully grown. The largest of 
the males differ very little from the females originally described, except 
that the chelipeds are proportionally a little larger. In the smaller 
specimens of both sexes there are rather fewer small tubercles upon the 
carapax, and the teeth of the lateral margins of the carapax and angles 
of the chelipeds are, perhaps, smaller and less lacineated proportionally, 
but the differences are very slight, and there is no approach to L. Pour- 
talesii as figured by A. Milne-Edwards. The accompanying table of 
measurements shows the slight variations in the proportions of the cara- 
pax and chelipeds better than description. In some specimens the 
chelipeds are slightly unequal, but in none conspicuously so, and when 
the difference was noticeable in the specimens measured the measure- 
ments of the cheliped were made from the larger one. 
CANCROIDA. 
Cancer borealis Stimpson. 
Taken off Martha’s Vineyard, in 1880, 1881, and 1882, at a great num- 
ber of the stations, in 51 to 317 fathoms, and also in shallow water ; off 
Delaware Bay, 1881, stations 1047 and 1049, 156 and 435 fathoms; and 
off Chesapeake Bay, 1880, stations 896, 897,899, and 901,18 to 157 
fathoms. Most of the deep-water specimens taken by the Fish Com- 
mission are small, but much larger specimens, among them several from 
100 to 130 millimeters in breadth of carapax, were taken in 1880, by 
Alexander Agassiz, on the Blake, off the Carolina coast, in 142 to 233 
fathoms. The largest of these specimens were from, Blake station 314; 
''N. lat. 32° 24’, N. long. 78° 44’, 142 fathoms. 
Cancer irroratus has not been taken in any of the deeper dredgings 
off Martha’s Vineyard, although it is a common littoral and shallow- 
water species on the whole New England coast, and was taken by Alex- 
ander Agassiz at several stations, in 65 to 178 fathoms, off the Carolina 
coast, even occurring with C. borealis at station 314, just mentioned. 
Geryon quinquedens Smith. 
Trans. Conn. Acad., vy, p. 35, pl. 9, figs. 1, 2, 1879; Proc. National Mus., iii, p. 
417, 1881; Bull. Mus. Comp. Zool. Cambridge, x, p. 6, 1862. 
Specimens examined. 
2 : No. of speci- 
3 S mens. 
Locality. a - 
& 1 earape 7 
a Nature of bottom. a) 
| S 
N. lat. W. long. a | ps 
> ' i] 
Be a 
A e 
| Station No. 
OFF MARTHA’S VINEYARD. 
(= th a ° 1 hae 1880. 
881! 39 46 30 70 54 00 325 | M. Sept. 13 1 
893 | 49 52 20 70 53 00 372 sft. bn. M.sml.St. | Oct. 2 1 0 
