GAMMARIDEAN AMPHIPODA 129 



Type-locality.— Station 7231, 27°24'00" N, 115n2'15'' W, 2398- 

 2475 m, Jan. 1, 1961. 



Relationship. — This species fits the diagnosis of Pardaliscopsis 

 Chevreiix (1911) except for the symmetrical lobes of the upper lip and 

 the broad lobes of maxilla 2. It might be assigned to Pardaltscella 

 Sars except for the broad second maxillae and the occurrence of dorso- 

 posterior teeth on pleonites 4 and 5, the lack of which Birstein and 

 Vinogradov (1962) use as a character for distinguishing Pardaliscella 

 from Hallce Boeck. The species at hand differs from Halice in the 

 toothed mandibles, and from Pardaliscoides Stebbing by the short fifth 

 and long sixth articles of the gnathopods and the short second article 

 of antenna 1. Otherwise the mouthparts of Pardalisco'psis copal re- 

 semble those of Pardaliscoides. 



The combination of toothed mandibles, symmetrically lobed upper 

 lip, short article 2 of antenna 1, toothed pleonites 4 and 5, cleft telson, 

 halice gnathopods, and stout second maxillae may warrant the erection 

 of a new genus for P. copal. 



Pardaliscopsis (?) tikal, new species 



Figures 63, 64 



Diagnosis or female. — Similar in its generic characters to Pardali- 

 scopsis (?) co2)al described above ; differing from that species in deeper 

 incision of upper lip, in broader head with more strongly rounded and 

 less projecting lateral cephalic lobes; accessory flagellum 5-articulate, 

 terminal article veiy small ; mandibles similar but right with four dis- 

 tinct teeth on cutting edge; spines of outer plate of maxilliped larger, 

 dactyl of maxillipedal palp shorter than m. P. (?) copal; coxa 5 with 

 slightly sinuous ventral margin; gnathopods with sixth articles 

 scarcely tapering distally, article 5 of gnathopod 1 shorter, of gnath- 

 opod 2 equal to article 6; pereopod 4 with article 2 slightly broader 

 than in P. m copal; uropod 3 with article 2 of outer ramus very short ; 

 pleonal epimeron 3 with posterior margin convex and posteroventral 

 corner rounded ; pleonite 4 dorsally bidentate, 5 unidentate. 



]\Iale. — Antenna 1 with bases of flagellum and accessory flagellum 

 each conjoint, broken apically; pleonite 5 with dorsal tooth elongate; 

 uropods 1 and 2 better preserved than in female and showing four 

 marginal spines on outer ramus of uropod 1, and two marginal and 

 four small submarginal spines on outer ramus of uropod 2. Length, 

 4.0 mm. 



Holotype. — AIIF No. 6033, female, 4.1 mm. 



Type-locality.— Station 7229, 27°54'25'' N, 115°40'00" W, 1720 

 1748 m, Dec. 31, 1960. 



Material. — Six specimens from the type-locality. 



