76 
*S. 1. Smith — Crustaceans of the Atlantic Coast. 
Locality. Sex. Length. 
Rostrum. 
Supraorbital 6pines each 
Cashe’s Ledge, 3 
15'0 mm 
3 + 7 
3 
Two. 
ll It 
14-3 
3 + 5 
2 
Two, one very small. 
Halifax, 
12-0 
2 + 3 
1 
One only ! 
“ $ 
175 
4 + 7 
3 
Two, one very small. 
Mass. Bay, “ 
18-0 
3 + 6 
4 
Two, one scarcely pert 
Cashe’s Ledge. “ 
19-0 
4 + 5 
4 
One only ! 
It It 
21-8 
3 + 6 
4 
Two well-developed. 
it ll 
21-3 
4 + 7 
6 
ll il 
ll It 
240 
4 + 4 
5 
11 li 
Norway, “ 
22-6 
4 + 6 
7 
ll u 
Casco Bay, “ 
290 
3 + 5 
6 
it li 
Grand Menan, “ 
32-6 
4 + 6 
5 
ll ll 
it u 
355 
4 + 6 
5 
ll ll 
u a 
37-0 
4 + 6 
4 
ll ll 
[ble. 
The form of the telson and the number of its dorsal aculi and ter- 
minal spines was usually very constant in all the specimens examined. 
In thirty-five out of forty-four individuals there were four pairs of 
aculi, or four upon one side and five upon the other : of the remainder, 
six (two males, 21 and 26 mm long, and four females, 19 to 36 - 5 mm 
long) had five pairs ; a male of 25 mra , five upon one side and six 
upon the other; a female of 37 mn ‘, four upon one side and three upon 
the other; and a female of 25’5 mm , only three pairs. In thirty-seven 
specimens in which the spines of the tip were specially examined, only 
one (a female 36 ram long, from Halifax, Xova Scotia, and in all other 
respects perfectly normal) varied from the normal number, this speci- 
men having three small ciliated spines in the middle in place of the 
two in normal specimens. This is a case precisely similar to that 
noticed under H. Gaimardii , and figured on Plate IX, figure 9, 
except that in this case there seems to be no variation whatever in 
the form of the terminal margin itself. 
In life the males at least are semi-translucent, and specked and 
irregularly mottled with obscure brownish red on the carapax and 
appendages. 
