352 U.S. NATIONAL MUSEUM BULLETIN 271 



quadrimana was in error, the type should remain that species for 

 purposes of stabiUty. Boeck's material was named Normanion sarsi 

 by Stebbing (1906). 



Mouthparts forming pseudoconical bundle or not; epistome appla- 

 nated, not distinct from upper lip; mandibular molar conical or 

 nearly obsolete, not ridged (?except A^. abyssi Chevreux), palp 

 attached proximal to molar; outer plates of maxilliped almost or 

 greatly exceeding palp, palp essentially 3-articulate, scarcely or 

 slightly exceeding inner plates, article 4 obsolete; gnathopod 1 mod- 

 erately pow^erful, subchelate, palm transverse; peduncle of uropod 3 

 elongate; telson short, quadrate, entire. Species: 3, N.E. Atlantic, 

 Mediterranean, littoral to abyssal (some fish commensalism) . 



Ocosingo J. L. Barnard 



Ocosingo J. L. Barnard, 1964b. 



Type-species: 0. borlus J. L. Barnard, 1964b (original designation). 



Mouthparts substyliform, forming ventral subcorneal bundle; man- 

 dible bearing vestigial molar ridge, palp attached quite proximally; 

 palp of maxilla 1 uniarticulate ; maxillipedal palp scarcely exceeding 

 outer plate, 3-articulate, ultimate article cla\dform; gnathopod 1 

 simple, article 6 longer than 5; coxa 1 projecting over side of head; 

 uropod 3 lacking rami; telson small, entire. Species: 1, California, 

 littoral. 



Onesimoides Stebbing 



Onesimoides Stebbing, 1888; 1906. 



Type-species: 0. carinatus Stebbing, 1888 (monotypy). 



Upper lip and epistome not differentially produced, mandibular 

 molar ridged, palp attached level with molar; gnathopod 1 subchelate 

 or slightly chelate, article 5 much longer than 6, gnathoj^od 1 rather 

 enlarged in males; outer ramus of uropod 3 biarticulate, inner ramus 

 half or less as long as outer; telson entire; article 1 oj first antennal 

 flagellum 5 times as long as next article (Paronesimoides) . Species: 

 3, Indo-Pacific tropics, bathyal to hadal. 



Onisimus Boeck, new synonymy 



Onisimus Boeck, 1871. 



Pseudalibrotus Delia Valle, 1893.— Stebbing, 1906. 



Type-species: Anonyx litoralis Kr0yer, 1845 (selected by Boeck, 

 1876). Stebbing, Sars, and Delia Valle apparently overlooked the 

 fact that Boeck (1876) selected Anonyx litoralis as type of Onisimus. 

 Delia Valle erected Pseudalibrotus and cited only A. litoralis, thus 

 making it type of the genus by monotypy. All species of Pseudali- 



