GAMMARIDEAN AMPHIPODA 97 



Oediceroides and Alonoculodes, leaves no mark of distinction but the 

 rostrum of Aceroides ; however, no known species of Oediceroides or 

 Monoculodes^ except 0. synparis^ has ventrally excavate coxae 3 and 4. 

 Tlius, O. synparis is removed to Aceroides and joins A. limicola^ A. 

 sedovi, A. kohjakovae and J.. latipes. 



Oediceroides (Lopiceros) forensia J. L. Barnard (1961) remains 

 problematical but it is similar to various species of Oediceroides in 

 its gnathopods, mouthparts, coxae, and pereopods. On the other 

 hand, it differs from members of Oediceroides in its abnormally long 

 antenna 1, its short rostrum, its abnormally short antenna 2, and the 

 basally inflated flagellum of antenna 2. 



Anoediceros Pirlot (1932) is a genas of dubious position. It re- 

 sembles Oediceroides in its somewhat similar antennae, although an- 

 tenna 1 of Anoediceros is longer than that of typical members of 

 Oediceroides. The rostrum of Anoediceros, like that of Aceroides., is 

 obsolescent. The monotypic Anoediceros has none of the characters 

 distinguishing the subgenus Lopiceros., nor the coxae distinguishing 

 Aceroides. It differs from Oediceroides mainly in the presence of a 

 small bifid spine on the outer lobe of maxilla 2, a small but rather 

 unusual character for a gammaridean genus but it is mimed by the 

 distinctive, simple, and short spine of Aceroides synparis. 



Aceroides Sars 



Aceroides Sars, 1S95, p. 340.— Stebbinff, 1906, pp. 254-255. 

 (Patoidcs) J. L. Barnard, 1964b, p. 33 (as a subgenus). 



Emended diagnosis. — Basal articles of antenna 2 not swollen; ros- 

 trum OBSOLESCENT, or absent, not extending more than one third along 

 article 1 of antenna 1; mandible variable, with weakly or strongly 

 PROJECTING primary cutting edge bearing weak or strong teeth (but 

 never as short, blunt or simple as the mandibles of We.'ificoodilla, 

 Batliyrnedon., or A rrhis) ; mandilnilar palp present, triarticulate, vari- 

 able in size and sctation, mandibular molar large, triturative; (inner 

 plates of lower lip separate in type-species but apparently fused in 

 some other species) ; inner plate of maxilla 1 with 1 to 6 setae, (thus 

 highly variable for an oedicerotid genus) ; maxilla 2 with or without 

 short, distinct spine on ^outer lobe; gnatiiopods subciielate, stout, 



PALMS oblique, FIFTH ARTICLES BEARING POSTERIOR LOBES, THOSE OF 

 GNATHOPOD 2 ALMOST OR FULLY GUARDING ARTICLE 6 ; COXAE 3 AND 4 



EXCAVATE BELOW ; coxa 4 not produced posteriorly ; pereopods 1 and 2 

 highly variable, generally article 4 with conspicuous midlateral row 

 of setae, article 5 expanded or not, article 6 expanded or very slender, 

 article 7 long, either slender or very expanded and saber shaped; 



