GAMMARIDEAN AMPHIPODA 



67 



tapering proximally, palm acutely chelate, lacking extraordinary com- 

 plex processes ; posterodistal spines on article 6 of pereopods 1 and 2 

 simple; pereopod 3 with subcircular article 2, posterior lobe extending 

 nearly to middle of article 4, latter slightly thickened; article 2 of 

 pereopod 5 very broad, slightly excavated posterodistally (not dam- 

 aged) ; postero ventral corners of pleonal epimera as follows: 1 

 rounded, 2 subquadrate, 3 rounded-quadrate, and 3 wdth slightly con- 

 vex, smooth posterior margin ; pleonite 4 with dorsal hump in adult fe- 

 male, nearly straight dorsally in juvenile; uropods 1 and 2 with both 

 rami spinose ; inner ramus of uropod 3 reaching apex of outer ramus ; 

 telson cleft 40 percent of its length, each apex with one large spine. 



Figure 28. — Orchomeve tabasco, new species, holotype, female, 7.0 mm, 7229: a, maxilla 1; 

 b, epistome-labium complex, left lateral; c, mandible; d,e, antennae 1,2; /, maxilla 1; 

 g,h, gnathopods 1,2, minus setae; i, maxilliped; ;', lower lip. 



HoLOTYPE. — AHF No. 6032, female, 7.0 mm. 



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

 1748 m, Dec. 31, 19G0. 



]VL\TERiAL. — Holotype and one juvenile, 2.4 mm long, from the type- 

 locality. 



Relationship. — This species fits into the complex of species sur- 

 rounding Orchomene j)'mguis (Boeck) , just discussed above. The con- 

 gruency is seen in the condition of the following characters: lateral 



