S. I. Smith — Crustaceans of the Atlantic Coast. 
65 
from 16*5 to 50 mm ), from various localities on the New England coast, 
forty-seven had the normal number of epipodi, while five had epipodi 
upon one or both of the second pair of legs. Three of the latter are 
from the Bay of Fundy : one, a male 35 mm long, has well-developed 
epipodi on each of the second pair of legs ; another male, 36 mm long, 
has a short epipodus on the left side but none on the right ; the other 
specimen, a female 47 mm long, has a well-developed epipodus on the 
right side but none on the left. The two others are from Casco Bay : 
a female, 36 mm long, with a short epipodus on the left side, and a male, 
28 mra loug, with a rudimentary one on the right side. As the mea- 
surements of these specimens show, the presence of the additional 
epipodi is not a characteristic of the young. 
The number and position of the teeth upon the rostrum and dorsal 
carina of the carapax vary considerably more than is usually indicated 
in the descriptions of the species and yet are very characteristic 
specifically. Except as a result of injury, the tip of the rostrum is 
always acute and without teeth, and there are never teeth upon the 
dorsal margin except near the base. The most usual formula for the 
dentition is — i- or the third dorsal tooth being usually just 
3 3 
above the base of the rostrum; in the series of specimens examined, 
Number of specimens and variation in length. 
*ormuia. 
Males. 
Females. 
Total. 
3 + 1 
3 ° r 
2 + 2 
~ 
45, 
from 16 to 39 mm 
45, 
from 16’5 to 50 ni m 
90 
3 + 1 
~2~ ° r 
2 + 2 
~ 2~ 
14. 
' 
“ 15 “ 35 “ 
16, 
“ 15 “ 40 “ 
30 
3 + 1 
or 
4 
2 + 2 
4 
8, 
“ 22 “ 33 - 5 mm 
8, 
“ 15-5 “ 50 “ 
16 
3 + 2 
or 
3 
2+3 
3 
8, 
“ 27 “ 40 “ 
8 
2 + 1 
or 
3 
3 + 0 
3 
1, 
30 “ 
8, 
“ 20 “37.5“ 
9 
2 + 1 
4 
9 
27 and 32 “ 
2 
3 + 2 
4 _ 
9 
"i 
40 and 44 “ 
O 
2 + 2 
~5~ 
i, 
31 “ 
1 
2 + 3 
l, 
30 “ 
1 
3 to 5 
2 to 6 
70 
89 
159 
Teams. Conn. Acad., Von. V. 9 January, 1879. 
