PLATE 272. 



■^^^fe^^^^^^^ •*^^"-^^ 



THE RIVER CRAY-FISH. (One and one-half times natural size.) 



Cambarus affinis, Erichson. (p. fil2.) 

 Diawiiii; I'V H. L. Tmlil, from spi-ciiuen iilitaJPLil at mivre ik- Graix-, Mil. 



