232 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Mandibles with triarticulate palp. Maxillipeds with five- 

 jointed palp. 



First pair of legs subchelate ; carpus very minute ; propodus 

 oblong, with hind margin bearing several stout spines at junction 

 with palm ; dactyl nearly as long as propodus and deeply serr.ated. 

 Succeeding legs with numerous spines ; merus prolonged on 

 anterior margin and armed with a group of long spines. Coxa! 

 plates very small. 



Fig. 74. Asellus communis. 



Abdomen composed of two short segments which are visible 

 only on the mid-dorsal line and a large terminal one which is 

 nearly as long as it is wide and has the postero-lateral angles 

 rounded and the posterior margin produced in a broad triangular 

 process between the uropods. Uropods as long as last segment 

 of abdomen; rami styliform, inner ramus as long as peduncle, 

 outer one about two-thirds as long. 



Length 15 mm. 



Distribution: Potomac River; Schuylkill River, Pennsylvania; 

 Cincinnati, Ohio; Mississippi; Michigan; Illinois; Indiana; 

 Massachusetts; Rhode Island; New Haven, Canaan, Berlin, 

 Connecticut. 



