IO2 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



accessory flagellum about five- jointed. Second antennae with 

 long and slender peduncle having last joint a little shorter than 

 preceding one; flagellum shorter than peduncle. 



First four coxal plates deeper than their respective segments, 

 the fourth deeper than wide ; first three with small tooth at 

 postero-inferior angle. 



First gnathopods of male with carpus and propodus subequal ; 

 merus with a tuft of very short setae on posterior side; carpus 

 with a similar tuft at distal end of anterior margin; propodus 

 suboval, with palm quite evenly convex, very oblique and con- 

 tinuous with posterior margin of joint which it equals in length. 

 Second gnathopods of male with propodus very large and strong 

 and with oblique palm which has a large triangular tooth near 

 distal end and is terminated proximally by a large spine tooth. 

 In female, first gnathopods closely resembling those of male, but 

 with a relatively longer carpus and smaller propodus. Pereiopods 

 slender and elongated, with large, oblong basal joints which are 

 serrated on posterior margins. 



Posterior margins of abdominal segments produced into 

 teeth, the median one of which is the largest, that of the fourth 

 abdominal segment being the largest of all. 



Last pair of uropods elongated., with outer ramus having sides 

 nearly parallel to near the tip and armed with several fascicles 

 of spines on each margin ; inner ramus minute. 



Telson with each lobe terminating in an acute point on inner 

 side of which is a large and a small spine and on outer a spine 

 or seta. 



Colof yellowish, with broad transverse bands of dark reddish 

 brown. 



Length 16 mm. 



The species is extensively distributed in the Arctic regions, 

 Norway, Labrador, Buzzards Bay. Several specimens were 

 dredged, according to Holmes, in Rhode Island waters, off Fishers 

 Island from 7^ to 430 fathoms (Rathbun), Long Island Sound. 



Elasmopus Costa. 



Body strongly built and smooth. Coxal plates moderate; 

 fourth pair being largest and distinctly emarginate behind. 



