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U.S. NATIONAL MUSEUM BULLETIN 2 59 



Abdominal side plates : posterior margins convex to nearly straight, 

 with 2 or 3 setae each; posterior corners poorly developed, rather 

 blunt; ventral margins of plates 2 and 3 with 4 spines each. Pleopod 

 1, inner ramus about equal m length to peduncle. Uropod 1 with 

 up to 30 spines; inner and outer ramus about equal in length, a little 

 more than 50 percent as long as peduncle. Uropod 2 with up to 

 18 spines; outer ramus about 80 percent as long as inner ramus, 



Figure 5. — Stygonecles cooperi, new species. Male holotype (6.00 mm), Silers Cave, 

 W. Va.: a,b, antennae 1,2; c, coxal plate of pereopod 3; d-g, pereopods 4,5,6,7; h, ab- 

 dominal side plates; i, lower lip; /, telson; k,l, gnathopods 1,2; m,n, uropods 1,2; o,p, 

 3rd uropods. 



