30 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



Blind. Head .sliohtly long-er than the first thoracic segment, con- 

 cave on its anterior margin at the l)ases of the first antennjB and con- 

 vex l)etween them. First antennae in the male half to two-thirds as 

 long as the body; in the female about half as long as the body; fiagel- 

 lum four or five times as long as the peduncle and consisting in the 

 male of about thirty-five segments, all but the first seven or eight 

 of which are provided with slender olfactory clubs; secondary flagellum 

 slightly longer than the first segment of the primary one (usually 

 shorter in the female) and composed of two segments, the distal one 

 verv short. Second antenn;i' oidv a])out one-half as Ions.;' in th(> first 



Fig. 2. — EUCRANGdNYX MUCRONATUS. ant. 1, FIRST antenna; CUlt. '2, SECOND antenna; gn., GNATHO- 



pod; T., telson; ur., uropod; gn. 1 9, gn. 2 $, and T. ? from a female; other figures from 



pair; peduncle extending beyond that of the first pair; the two distal 

 segments elongated, about eijual in length; flagellum slightly shorter 

 than the peduncle and composed of about ten segments. 



In the male the carpus of the first gnathopods is broadly triangular, 

 fully as l)road as the propodus; propodus about two-thirds as broad as 

 long; anterior and posti^rior margins only slightly convex, the poste- 

 rior furnished with three small fascicles of long hairs; palm very o))- 

 lique, slightly concave at the center, with a broad lamellar edge, fur- 

 nished with two or three fascicles of long hairs, and about ten notched 



