No. 26.] ARTHROSTRACA OF CONNECTICUT. 



119 



Fig. 31. Orchestia agilis. 



First gnathopods of male subchelate, with carpus longer than 

 propodus and provided with a prominent rounded lobe at distal 

 end of posterior margin ; propodus widened distally, with infero- 

 posterior angle produced into large rounded lobe against which 

 the dactyl closes, distal end of propodus rather deeply notched. 

 Second gnathopods with large oval propodus and small carpus; 

 palm of propodus oblique and convex, slightly notched near 

 posterior end; dactyl long and curved. In female, first gnatho- 

 pods simple, with propodus shorter than carpus and tapering 

 slightly distally. Second pair with carpus rounded on posterior 

 margin ; propodus shorter than carpus, oval, with a minute dactyl 

 articulated on anterior margin and not reaching distal end of 

 segment. 



