508 



i>h'oci:i:nix<;s of the NATIONAL museum. 



VOL. XXXV. 



middle; carpus longer than merus, produced behind a little more 

 than in front; dactyl attenuate, shorter than propodus. Postero- 

 inferior angle of third abdominal segment produced into an acute 

 tooth, above which the margin is strongly bisinuate. Fourth ab- 

 dominal segment with a rather prominent dorsal crest which is 

 rounded behind. 



First uropods reaching but slightly beyond peduncle of third pair, 

 with equal rami about as long as the peduncle; outer ramus with- 

 out spines; inner with several, mainly on basal half. Second uro- 

 pods with equal rami about as long as peduncle, armed on one side 

 with several spines, along subterminal spine on outer ramus. Rami 

 of third pair broad, equal, furnished with long plumose setse, inner 



Via. 17. — AMPELISCA ClilSTATA, FEMALE. ()lh. FIRST GNATHOPOD ; (jn?. SECOND GNA'lllu- 

 POD; 1>:u THIRD PERiEOPOD ; /':., FIFTH PER^iOPOD. 



with a prominence on lower side of base. Telson elongated, tip 

 rounded and armed with several spinules. 



Length. — 14 mm. 



Locality. — Station 4304, off Point Loma, 25 fathoms. 



Type.— Cat. No. 38541, U.S.N.M. 



Additional locality. — Station 1540, Monterey Bay, 50-57 fathoms. 



This species is very closely allied to A. macrocephala, but differs 

 in having ;l single well-developed crest on the dorsal side of the 

 fourth abdominal segment instead of a depression followed by a 

 small carina: the telson differs in having several spinules at the tip 

 <it' each lobe instead of a single one; the rami of the terminal uropods 

 are somewhat broader. 



