CRAYFISHES. 401 
CAMBARUS CLYPEATUS Hay. 
Proc. U.S. Nat. Mus., Oct. 11, 1899, 22, p. 122, fig. 2. 
The type specimen of this species, a female, U.S. Nat. Mus., No. 17,277, 
is the only one known. It was found by Mr. G. A. Coleman, of the U.S. Bio- 
logical Survey, in April, 1892, in a skiff at Bay St. Louis, Miss. Mr. Hay sur- 
mises that it belongs in the neighbourhood of C. cubensis; I should incline rather, 
on account of the structure of the annulus ventralis and the shape of the body, 
to place it in C. bartonw group. 
