MARINE GAMMARIDEAN AMPHIPODA 339 



or level with molar; gnathopod 1 slender, simple; coxae 1 and 2 small 

 and partially hidden by coxa 3; telson long, deeply cleft. Species: 2, 

 arctic to Pacific tropics, epi- to ?abyssopelagic. 



Cyphocaris Boeck 



Cyphocaris Boeck, 1871. — Stebbing, 1906. 



Type-species: C. anonyx Boeck, 1871 (monotypy). See Stebbing, 

 1888 (as C. micronyx); Schellenberg, 1926b, 1927. 



Epistome and upper lip not differentially produced; head deformed; 

 mandibular molar of medium size, ridged, palp attached level with 

 molar; gnathopod 1 simple, articles 5 and 6 equal; gnathopod 2 

 nearly simple, article 5 only sHghtly longer than article 6; coxae 1, 

 2, and 3 small, partially hidden by large coxa 4 ; article 2 of pereopod 

 3 deeply indentured or not, or with long posterior cusp; pereopods 

 1-4 decreasingly prehensile or not prehensile; telson long, deeply 

 cleft. Species: 7, cosmopolitan, bathy-abyssopelagic. 



Danaella Stephensen 



Danaella Stephensen, 1925b. 



Type-species: D. mimonectes Stephensen, 1925b (monotypy, origi- 

 nal designation in title). 



Body globular, with pereonites 3-6 especially enlarged; accessory 

 fiagellum absent; epistome and upper lip not prominent; mandible 

 simple, lacking molar and palp; maxilliped composed of large oper- 

 cular outer plates covering smaller curved inner lobes; gnathopod 1 

 simple, dactyl very short; gnathopod 2 simple; coxae 1 and 2 small 

 and hidden by folio \\ing coxae; inner rami of uropods 1 and 2 short 

 and spiniform; uropod 3 a vestigial microscopic bud; telson probably 

 absent; urosome possibly consisting of two segments with a vestigial 

 third. Species: 1, Atlantic, bathypelagic. 



Derjugiana Gurjanova 



Derjugiana Gurjanova, 1962. 



Type-species: D. mso/ito Gurjanova, 1962 (monotypy). 



Mouthpart group conically produced, mouthparts styliform; man- 

 dible lacking molar, palp attached proximally; maxillipedal palp not 

 exceeding outer plate, article 4 short and not claw-shaped; gnathopod 

 1 chelate, article 6 longer than 5; inner ramus of uropod 2 slightly 

 constricted, uropod 3 lacking rami; telson short, entire. Species: 1, 

 Okhotsk Sea, littoral. 



