No. 26.] ARTHROSTRACA OF CONNECTICUT. I4I 



little longer than carpus, broad, oval quadrangular in form ; palm 

 oblique and convex and longer than hind margin ; dactyl strong 

 and denticulated within. Second gnathopods more strongly built 

 and with larger propodus than first pair ; carpus short, with lobe 

 much narrower than in first pair ; propodus with the palm some- 

 what sinuous and defined behind with a distinctly projecting 

 angle and a stout spine; dactyl stout, with several serrations 

 within. Gnathopods in the male considerably stronger than in 

 female, with propodus comparatively larger; palm of first pair 

 slightly excavated ; in the second pair much shorter than the 

 hind margin and defined by a strong acuminate process. Pereio- 

 pods stout. Third pair with propodus slightly expanded distally 

 forming a kind of palm armed with a slender spine against which 

 the short, stout dactyl strikes ; last two pairs of nearly equal 

 length, with basal joints oblong oval in form. 



Last pair of uropods with the outer ramus scarcely as long as 

 peduncle, biarticulate, with terminal joint very minute and tipped 

 with a long spine; inner ramus minute. Telson less than twice 

 as broad as long, triangular in fomi. 



Length 5 mm. 



Distribution : Arctic Ocean, Greenland, Iceland, Norway. I 

 met with a single female specimen from Long Island Sound in 

 the collection. in the U. S. National Museum obtained from the 

 region about Noank, Connecticut. 



Podoceropsis Boeck. 



Antennae slender and subequal in length, peduncles elongated, 

 densely setiferous, no accessory flagellum. 



Mandibular palps elongated and densely setose. Other mouth 

 parts normal. 



Gnathopods very unequal, the first pair being feeble ; the 

 second pair being much larger and very powerfully developed in 

 male. Posterior gnathopods with basal joint moderately ex- 

 panded. First two pereiopods glandular. 



Last pair of uropods scarcely extending beyond the others ; 

 rami subequal. Telson rounded, tubular. 



