36 S. I. Smith — Crustaceans of the Atlantic Coast. 
The chelipeds, in the largest male examined (figure l£>), as well as 
in the females and young, are only slightly unequal and rather slender. 
The fingers on each hand are about as long as the basal portion of 
the propodus and their thin prehensible edges are armed with sharp 
serrations which shut slightly by on the two fingers when the dactylus 
is closed. The dactylus- of the larger cheliped, in all the specimens, 
has, in addition to the serrations, a small obtuse tubercle near the 
base. In the only specimen of G. tridens examined (a male consid- 
erably larger than the largest specimens of G. quinquedens ) , the 
chelipeds are more unequal, the larger being proportionally stouter, 
and the teeth of the prehensile edges of the fingers are more obtuse 
and the proximal ones even obtusely tuberculiform ; this may be, 
however, only a character of very old individuals. The sternum, 
ambulatory legs, and abdomen afford no distinctive characters. 
The following are measurements of seven of the nine specimens 
before me, and also of a specimen of G. tridens , from Christiania 
Fiord, Norway, received from Professor G. O. Sars. 
Carapax. a, 6 
b, $ 
/, 6 
c, 5 
/,? 
d , 9 
e. 9 
G. tr i- 
dens 
Length including frontal teeth, 33mm 45 
28-7 
28-5 
25-6 
21-7 
12-2 
56 
Breadth including lateral spines, 45 
58 
36-8 
38 
33-7 
291 
16-7 
75 
Ratio of length to breadth, 1:1 36 
1:1-29 
1:1-28 
1:1-33 
1:1-32 
1:1-34 
1:1-37 
1:1-34 
Breadth in front of lateral spines, 39 
51-8 
325 
32-3 
29-2 
24-4 
13-8 
64 
Ratio of length to this breadth, 1:1-18 
1:1-15 
1:1-13 
1:1-13 
1:1-14 
1:113 
1:1-13 
1:1-14 
Length of posterior legs, 
95 
57 
52 
50 
39 
24 
115 
This very interesting species was first known to me, about ten 
years ago, from two specimens, in the collection of the Portland 
Society of Natural History, obtained by Mr. C. B. Fuller from 
stomachs of fishes taken in deep water off Casco Bay. These speci- 
mens wex-e somewhat shrunken from partial digestion, immersion in 
alcohol and subsequent drying, and the measurements (given above 
in column a) of the smaller one of the two may be slightly incorrect. 
The other specimens which I have examined were all taken in deep 
water in the Gulf of Maine, off Massachusetts Bay. The largest two 
of these ( b and c) were obtained, August 19, 1877, by Professor 
Verrill and party of the United States Fish Commission on board the 
“ Speedwell,” at 160 fathoms, soft muddy bottom, about forty miles 
east of Cape Ann, latitude 42° 38' north, longitude 69° 38' east. 
Two others were dredged off Massachusetts Bay by Px-ofessor Packard, 
while on board the “Bache” in September, 1873: a female (c?), 
carrying an abundance of eggs, in latitude 42° 18' north, longitude 
69° 49' east, 142 fathoms, soft blue mud; and a very small female 
(e), latitude 42° 20' north, longitude 70° east, 117 fathoms, on a bot- 
