100 



U.S. NATIONAL MUSEUM BULLETIN 271 



Figure 49. — Ischyrocerldae, pereopods glandular, like Isaeidae and Aoridae but uropod 3 

 with elongate peduncle and outer ramus with minute distal ornament?: a, coxa 4, note 

 lack of posterior excavation; b, extremes of accessory flagellum; c,d, uropod 3 and enlarged 

 rami, note elongate peduncle and minute nonarticulate ornaments on outer ramus [see 

 Isaeidae, Aoridae, Corophiidae, Ampithoidae]; e, telson, short, thick, fleshy. 



Ampithoidae have characteristic lower lips. Podocerldae have elongate urosomite 1. 



