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



First antennffi longer than second, with well developed acces- 

 sory flagellum. 



Mandibles and maxillje normal. Maxillipeds comparatively- 

 large, with inner and outer plates small, and palp very slender 

 with third joint very much elongated. 



Gnathopods unequal in structure; first pair distinctly sub- 

 chelate with ischium laminarly expanded. Second pair slender 

 with dense setse along front edge; carpus large; propodus short 

 and tapering without a distinct palm. First two pereiopods 

 glandular and with propodus unusually slender and elongated. 



First and second uropods robust, and armed with strong 

 unguiform spines ; last pair small. Telson small and tubular. 



Leptocheirus pinguis (Stimpson.) 



1853. Ptilocheirits pinguis, Stimpson, Smithson. Contrib. 

 Knowl., vol. 6, No. 5, p. 56. 



1888. Leptocheirus pinguis, Stebbing, Rep. Voy. " Chal- 

 lenger," vol. 29, p. 279. 



Body broad. Eyes oval or reniform. 



First antennjE longer than second pair but not so stout, last 

 joint of peduncle short, second joint longer than the first; prin- 

 cipal flagellum slender, composed of twenty or more segments, 

 longer than the peduncle ; accessory flagellum well developed. 

 Second pair of antennae with flagellum about one and a half times 

 as long as last peduncular joint. 



First gnathopods larger than the second ; coxal plate prolonged 

 considerably anteriorly ; carpus rectangular and as long as pro- 

 podus, with dense setae on posterior margin ; propodus slightly 

 broader distally than proximally, palm transverse, posterior 

 margin with dense setas ; dactyl short and curved ; carpus bent 

 inward at nearly right angles to the proximal joints. Second 

 gnathopods with basal joint slightly rounded in front and fringed 

 with very long plumose spines ; carpus longer than propodus 

 and somewhat broader, provided with very thickly set setae on 

 hind margin ; propodus slightly tapering in form, with short palm 

 and with hind margin densely covered with long setae. First and 

 second pereiopods with spinning glands, and subequal in size ; 

 third, fourth, and fifth periopods with basal joints well rounded 

 and increasing in length posteriorly. 



