MARINE GAMMARIDEAN AMPHIPODA 373 



bundle, elongate; upper lip elongate; mandible lacking molar, palp 

 long, 3-articulate, article 1 elongate; lower lip lacking inner lobes, 

 outer lobes apically acuminate; maxilla 1 with minute, vestigial 

 palp or none; maxilla 2 elongate; maxillipeds lacking palps, inner 

 plates acuminate, outer lobes operculiform; gnathopods simple or 

 mero- and carpochelate; uropod 3 biramous; telson of medium length, 

 entire. 



Relationship. — Of the suborder Gammaridea, only the Ochlesidae 

 and the genus Danaella (see also Thoriella and Chevreuxiella) in 

 the Lysianassidae lack a maxillipedal palp. This lack is characteristic 

 of all members of the suborder Hyperiidea but Ochlesidae appear 

 in other respects to be so closely related to gammarideans that they 

 are retained therein. The large coxae are especially characteristic 

 of gammarideans but the general body shape resembles that of the 

 Acanthonotozomatidae and StiUpedidae. 



Genera of Ochlesidae 



Ochlesis Stebbing 



Ochlesis Stebbing, 1910. 



Type-species: 0. innocens Stebbing, 1910 (monotypy). 

 Species: 3, S. Africa, Indonesia, Australia, littoral. 



Oedicerotidae 



Figures 135-138 



Diagnosis. — Accessory flagellum absent or vestigial; telson entire 

 or emarginate, very short; eyes when present usually coalesced 

 dorsally; head often massive and galeate (see glossary); anoculate 

 members assigned to the family on basis of aspects similar to shallow 

 water genera having coalesced eyes; pereopod 5 immensely longer 

 than pereopod 4; rami of uropod 3 scarcely longer than the elongate 

 peduncle. See Calliopiidae, Pleustidae, Isaeidae, Ampithoidae, Syn- 

 opiidae, Laphystiopsidae. 



Description. — Accessory flagellum absent; head often galeate 

 and massive, conspicuous rostrum usually present but occasionally 

 completely absent; mouthparts basic except for mandibular molar 

 which varies from strongly triturative to nontriturative and nearly 

 obsolescent; one genus lacking mandibular palp; gnathopods powerful 

 to weak, highly variable; coxae of medium size; rami of uropod 3 

 narrowly lanceolate, scarcely longer than the elongate peduncle; 



