136 

 OXYCEPHALlDiE. 



OXYCEPHALUS TUBERCULATUS, 8^. Bate. 



Oxyccplmlus tuhercidatus, Sp. Bate, Cat. Amphi. Crust., 343, pi. liv, f. 5. 



Locality: North Pacific Ocean. Latitude 5° north j longitude 128° 

 west. Collected May 10, 1873. 



Although taken in a widely-distant locality, there is no doubt of the 

 identity of this species with that described by Bate. The row of dorsal 

 tubercles, one anterior and one posterior, on each segment of the body, 

 the structure of the second pair of gnathopoda, and the rudimentary 

 character of the posterior pair of thoracic legs — falling short of the base 

 of the preceding pair — at once determines the species. They also agree 

 in the minor details of structure, as far as they are given by the author. 

 The head and first thoracic segment were wanting in his specimen. I 

 will therefore supply the omission in his description by an account of 

 the parts as they exist in the present specimen. 



Head not quite as long as the first five segments of the thorax, broad, 

 inferior margin broadly convex ', rostrum more than half the length of 

 the head, triangular, acute -, eyes large, covering the whole of the lateral 

 surfaces of the head ; the superior antennae broad, compressed; peduncle 

 three-jointed; first joint longer than the second; the latter short; the 

 third longer than the first and second, and having on the upper surface 

 near the apex a few auditory cilia; flagellum uniarticulate, short, slender, 

 slightly bent upward, and apex furnished with a few long auditory cilia. 

 Inferior antennae absent in the specimen. The first pair of gnathopoda 

 shorter than the second, but similar to them in other respects ; carpus 

 produced anteriorly nearly to the apex of the propodos, margins fur- 

 nished with a few long setse, not serrated ; propodos subovate ; dactylus 

 nearly half as long as the propodos. The flexible margins of the follow- 

 ing thoracic feet furnished with a few setse, or hairs. 



Length, .40 of an inch. 



LEPTOCOTIS, nov. gen. 



Animal long and slender. Head large and produced anteriorly into 

 a rostrum ; narrowed behind the eyes ; the constricted portion short, and 

 not narrower than the thorax ; under surface excavated anteriorly on 

 each side for the reception of the superior antennae. Superior antenn£e 

 short, sickle-shape. Inferior antennae five-jointed, folded upon them- 



