I3O CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Eyes nearly round, their distance apart slightly greater than 

 their diameter. 



First antennae shorter than second pair; first and second 

 segments of peduncle subequal in length and slightly longer than 

 third; flagellum about twice as long as peduncle and made up 

 of seven to nine joints. Second antennae half as long as the body ; 

 peduncle exceeding that of the first pair; last two joints elongated 

 and subequal; flagellum usually only slightly longer than that of 

 first pair. 



First gnathopods in the male with carpus longer than pro- 

 podus and having a rounded lobe posteriorly densely setose ; pro- 

 podus more than half as long as wide, subrectangular, provided 

 with a group of short cilia near the distal end of front margin 

 and a fascicle of long ones at the apex; palm nearly trans- 

 verse, slightly sinuous and provided with a prehensile spine; 

 dactyl strongly curved and shorter than palm. Second gnatho- 

 pods in the male with enormous oval propodus; carpus short, 

 with a long, slender lobe extending along the posterior margin 

 of propodus which is more than half as broad as long, palm 

 oblique, the middle portion slightly arcuate and provided with a 

 notch near the middle, armed with a submarginal row of spines, 

 prehensile angle prominent, rounded. Second gnathopods of 

 the female elongated, weak; carpus wider than propodus with 

 small, rounded lobe behind, provided with a group of setae; 

 propodus somew T hat curved and broadest distally, more than twice 

 as long as broad, posterior margin prolonged to form a chela with 

 the dactyl, which is shorter than the palm and not strongly 

 curved. Posterior margin of basal joints of last three pereiopods 

 serrate. 



Postero-lateral angles of third abdominal segment produced 

 slightly to form a triangular tooth; first two or three segments 

 usually produced dorsally to form a well marked posterior tooth 

 on the middle line. 



First uropods almost twice as long as the second pair. Ter- 

 minal pair very short, not exceeding the peduncle of the second 

 pair in length ; peduncle very short, nearly as broad as long, 

 furnished distally with a few setae ; ramus tapering, as long as 

 peduncle, with a few setae at apex. Telson short, entire, nearly 

 as broad as long and furnished with a slender seta on each side. 



