No. 26.] ARTHROSTRACA OF CONNECTICUT. 1 73 



slightly oblique. Second gnathopods with simple propodus ; 

 posterior margin of merus and carpus provided with very long 

 plumose spines; basal joint exceedingly stout; merus with hind 

 margin strongly convex ; carpus short and articulating with front 

 margin of merus; propodus subrectangular and slender; dactyl 

 strong and with denticle on inner margin. First and second perei- 

 opods with very long dactyl and stout propodus ; carpus short and 

 merus projecting anteriorly and distally as a moderate lobe. 

 Third and fourth pereiopods short ; carpus short and armed 

 distally with stout spines; basal joint of fourth pair with a few 

 setae on the posterior margin. Fifth pair of pereiopods very 

 long and slender with basal joint oval and with margins setose. 



First uropods with rami half as long as peduncle ; second pair 

 not projecting as far as first pair, with rami nearly as long as 

 peduncle and with apices rounded. Terminal pair uniramous, 

 peduncle very short and ramus broadly ovate, extending about as 

 far posteriorly as second pair. Telson very short and thick, 

 triangular, entire. 



The body is marked with purplish brown pigment cells and 

 the posterior margin of each segment bears a dark transverse 

 band. The anterior part of the head is dark. 



Length 3 mm. 



Distribution : New Jersey to Vineyard Sound. Noank 

 Harbor, taken at the surface in the evening, also found on piles 

 and among sponges growing on piles ; Noank, Long Island Sound, 

 Sea Flower Reef, New Haven, Connecticut. 



The species lives in soft tubes although it is often found free. 

 The tubes are particularly common in eel-grass near the roots. 

 It is very common at all depths to 30 fathoms. In dredging, 

 according to the Woods Hole Survey it is rarely found on muddy 

 bottoms. 



CHELURID^. 



Fourth to sixth abdominal segments coalesced. Coxal plates 

 small. 



Second antennas with blade-like flagellum. 

 Pleopods with peduncle produced on inner side. 

 Second and third uropods abnormal. 



