No. 26.] ARTHROSTRACA OF CONNECTICUT. 143 



second joint much longer than third; flagellum about as long as 

 peduncle. Second antennae with fourth and fifth joints of pedun- 

 cle subequal in length, third joint hardly twice as long as wide; 

 flagellum shorter than peduncle. 



First two pereiopods with spinning glands ; fifth coxal plate 

 taller than fourth and with a small posterior lobe. 



First gnathopods quite slender; carpus elongated and slender, 

 setose ; propodus shorter and narrower than carpus, more or less 

 fusiform ; palm not marked off distinctly from posterior margin ; 

 dactyl very long and curved, closing against entire posterior 

 margin. Second gnathopods large; carpus very short and cup- 

 shaped; propodus strong, suboval, palm finely tuberculated and 

 oblique, with a rather deep rounded excavation at middle which 

 is bounded by angular prominences, posterior margin setose; 

 dactyl strong and curved, scarcely reaching posterior angle of 

 palm. The male differs from the female in the fact that the 

 angular prominence of the palm toward the hinge is broadly 

 truncate and slightly emarginate, and the excavation is narrower 

 than in the female. 



First and second pereiopods with meral joints nearly as long 

 as carpus and propodus combined. Third pereiopods with basal 

 joint nearly as broad as long. 



Postero-lateral angles of third abdominal segment with a 

 very small projection. 



First uropods with peduncle considerably longer than the 

 styliform rami and with ventral margin prolonged to form a 

 slightly curved spine projecting below rami; third uropods with 

 rami equal in length to peduncle, extending as far posteriorly as 

 first but not quite so far as second, inner ramus slightly longer 

 than outer. 



Telson as broad as long with group of three setae on each 

 side of rounded apex. 



Length 7 mm. 



Distribution : Norway ; British Isles ; Grand Manan ; Eastport, 

 Maine; Rhode Island; Long Island Sound. 



The species occurs at depths of 30-40 fathoms. 



Leptocheirus Zaddach. 



Posterior portion of abdomen strongly built. Second pair 

 of coxal plates greatly expanded. 



