502 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv. 



joints strongly produced downward at the posterior angle; tarsi 

 about a third the preceding joint. 



Rami of third uropods longer than peduncle, the inner nearly as 

 long as outer and furnished with several spines and seta? on inner 

 margin. Telson tapering to a narrow tip, with two dorsal pairs of 

 spines, but no terminal ones. 



Length. — 20 mm. 



Locality. — A single female specimen, Station 4405, off San Clemente 

 Island, 654-704 fathoms. 



Type.— Cat. Xo. 38538, U.S.N.M. 



This species is larger than the two others assigned to this genus, 

 of which the larger reaches a length of 9.5 mm. It is distinguished 

 by being blind ; or at least no trace of eyes could be discovered in the 

 specimen examined, which was preserved in alcohol. The fourth 

 abdominal segment is not indented above as in the other species of 

 the genus; the outer plate of the maxillipeds is longer, the antenna?, 

 especially the second pair, are shorter, and the telson more pointed 

 and devoid of apical spines. 



Genus KOROGA," new. 



Epistome not very prominent. Upper lip projecting and clearly 

 defined from the epistome by an incision. Antenna? short. Mandible 

 with molar small; palp behind molar, the terminal joint narrow and 

 shorter than the preceding. Lower lip and first and second maxilla' 

 as in Onisimus. Maxillipeds with the outer plate extending beyond 

 the second joint of the palp, furnished with low teeth, but no spines 

 except one or more small ones at the apex; last joint of palp ungui- 

 form. Side plates deep, the anterior pair produced forward below. 

 First gnathopods stout; the carpus very short; hand short and broad, 

 but much longer than the carpus, subchelate with clearly defined 

 palm. Second gnathopods with the hand oblong, narrower than the 

 somewhat expanded carpus and not half as long, somewhat produced 

 at the infero-posterior angle; the minute dactyl articulated behind 

 (he middle of the distal margin. Gills simple. Last three pairs of 

 perseopods of nearly equal length with the basal joints expanded. 

 Infero-posterior angle of the third abdominal segment not strongly 

 produced. Terminal uropods with flattened lanceolate rami, the 

 outer ramus with a short second joint. Telson not deeply cleft. 



Type of genus. — K. megalops, new species. 



This genus is closely allied to Onisimus and Pseudalibrotus. From 

 both of these it differs in having a less developed molar on the man- 

 dible, in having the outer plate of the maxillipeds extend beyond the 

 second joint of the palp, in having stouter first gnathopods with rela- 



No etymology. 



