CRAYFISHES. 401 



Cambarus clypeatus Hay. 



Proc. TI. S. Nat. Miw., Oct. 11, IS'JO, 22, i). 122, tifr. 2. 



The type specimen of thi,s 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. cubcnsis; I should incline rather, 

 on account of the structure of the annulus ventralis and the shape of the body, 

 to place it in C. bartonii group. 



