GAMMARIDEAN AMPHIPODA 23 



phoxoceplinlids is visor-like and arched from side to side, but TJ ro- 

 thoides lias a very broad and flat rostrum with an upturned peripheral 

 flange (at least in the new species to be described) . Without the ros- 

 trum the genus would have the general appearance of a TJrotlioe or a 

 Carangol/a., two undisputed haustoriid genera ; however, the gnatho- 

 pods resemble those of phoxocephalids more than they do of haus- 

 toriids. 



In the Ilaustoriidae UrotJwkies is closest to OarangoUa, differing 

 from it by the occurrence of the rostrum, the long, deeply cleft telson, 

 the shapes of pereopods -4 and 5 and the strongly subchelate gnatho- 

 pods. It also resembles Z oh radio, a genus having a rostrum, but Uro- 

 tholdes differs by the fifth pereopod being phoxocephalid in structure, 

 by the enormous mandibular molars, and the biarticulate firet max- 

 illary palp. 



In the Phoxocephalidae, Zh'otlio'ides is closest to Micro plioxus J. L. 

 Barnard (1960b) but UrotJioides differs by the occurrence of an en- 

 larged mandibular molar, the elongated first mandibular palp article, 

 the larger plates of the maxillipeds, the shape of maxillipedal palp 

 article 2 and the smaller difference between pereopods 4 and 5 than 

 that found in Mlcrophoxus. 



Vrothoides inops, new species 



Figures 8-10 



Diagnosis. — Gnathopods 1 and 2 essentially identical, thus article 5 

 of gnathopod 2 with posterodistal protuberance similar to that of 

 gnathopod 1 ; posteroventral comers of coxae 2 and 4 sharply quadrate ; 

 article 6 of pereopod 3 distinctly longer than article 5 ; article 2 of 

 pereopod 4 extremely expanded, about 2.75 times as broad as article 

 4, posteroventral lobe extending at least one third along article 4; 

 when stenopodous portion of pereopod 5 folded along lobe of article 2 

 that lobe extending to apex of article 6, thus stenopodous portion rela- 

 tively short; inner ramus of uropod 3 plate- or scale-like, article 2 of 

 outer ramus very thin ; pleonal epimeron 3 forming an extended quad- 

 rate plate. 



Remarks. — Antennae carried in peculiar positions relative to each 

 other, first pair attached well under midpart of rostrum and thus pro- 

 jecting ventrally, second pair attached laterally at margin of rostrum 

 and thus projecting laterally and dorsally ; eyes absent; uropod 1 with 

 one spine on inner ramus, uropod 2 lacking ramal spines. 



HoLOTTTE. — AIIF No. 6027, female, 2.8 mm. 



Type-locality.— Station 7230, 27°52'25" N, 115°44'30" W, 2667- 

 2706 m, Dec. 31, 1960. 



JVLvTERiAL. — Three specimens from the type-locality. 



