126 
S. I. Smith — Crustaceans of the Atlantic Coast. 
A simple summation of the columns of the above table gives the 
following as the number of species found in the whole region under 
discussion, and the number of these species recorded from the regions 
specified : 
Number of 
species in list. 
S. Cape Cod. 
Cape Cod Bay. 
Mass. Bay. 
Casco Bay. 
Bay of Fuudy. 
Nova Scotia. 
G. of Maine, etc. 
G. St. Law. 
and Lab. 
Greenland. 
1 
Europe. 
Bering Sea. 
Brachyura, 
15 
12 
8 
7 
5 
4 
4 
5 
4 
3 
3 
2 
Anomura, 
7 
3 
1 
5 
5 
3 
3 
5 
4 
2 
4 
3 
Macrura, 
23 
5 
2 
16 
13 
12 
17 
17 
15 
13 
16 
9 
Total Decapoda, 
45 
20 
ii 
28 
23 
19 
24 
27 
23 
18 
23 
14 
Schizopoda, 
11 
4 
8 
4 
3 
2 
4 
6 
4 
6 
Cumacea, 
17 
7 
9 
9 
6 
6 
6 
10 
4 
9 
Total, 
73 
31 
n 
45 
36 
28 
32 
37 
39 
26 
38 
14 
This summation, however, does not fairly represent the Thoracos- 
tracan fauna of our northeastern coast, since it takes no account of 
the rare or accidental occurrence of species outside their regular 
habitats, and, in particular, becaiise it takes no account of the occur- 
rence of species, under favorable local conditions, far north and south 
of their ordinary limits. 
As has been previously remarked, the fauna of ('ape Cod Bay is 
an extension of the southern, or Virginian, fauna across Cape Cod, 
and should properly be excluded from the fauna of the coast of 
northern New England. Although the crustacean fauna of Cape 
Cod Bay is very poorly represented in the previous list, the number 
of species recorded is sufficient to illustrate its southern character, 
which is abundantly proved by the other classes of its inhabitants. 
Of the eleven species recorded from Cape Cod Bay, the following 
have not been recorded from elsewhere north of the Cape and do 
not, in any sense, belong to the fauna of northern New England : 
Gelasimus pugnax. Carcinus maenas. (,1) 
G. pugilator. Panopeus depressus. 
Platyonichus ocellatus. ! P. Sayi. 
With the single exception of the apparently cosmopolitan Carcinus , 
these species represent the extreme northern limit, on our coast, of 
the genera to which they belong, and of the genera themselves none 
