MARINE GAMMARIDEAN AMPHIPODA 239 



Accessory flagellum more than 4-articulate ; [lower lip unknown]; 

 inner plates of maxillae 1-2 densely setose medially; gnathopods 

 apparently normal; uropod 3 not exceeding uropod 1, rami equal, 

 lanceolate [outer ramus articles not described]; telson cleft shortly; 

 l)ody lacking dorsal teeth or spines (distinctions from Ceradocus by 

 NichoUs, 1938, unclear). Species: 1, antarctic (420 m). 



Ceradocopsis Schellenberg 



Ceradocopsis Schellenberg, 1926a. 



Type-species: C. kergueleni Schellenberg, 1926a (monotypy). 



Accessory flagellum more than 4-articulate; lower lip lacking inner 

 lobes; inner plates of maxillae 1-2 densely setose medially; gnathopods 

 normal; uropod 3 not exceeding uropod 1, rami equal, short, outer 

 2-articulate ; telson deeply cleft; body lacking dorsal teeth or spines. 

 Species: 1, Kerguelen Island, littoral. 



Ceradocus Costa 



Ceradocus Costa, 1853c, 1857.— Stebbing, 1906. 



Type-species: C. orchestiipes Costa, 1853c (monotypy). See 

 Chevreux and Fage, 1925. 



Accessory flagellum 3- or more articulate; lower lip with inner 

 lobes; inner plate of maxilla 1 densely setose medially, of maxilla 



2 moderately to strongly setose medially; gnathopods normal; uropod 



3 exceeding uropod 1, rami equal, lanceolate, broad or slender, outer 

 1 -articulate; telson deeply cleft; palp article 3 of mandible half as 

 long as article 2 {Metaceradocus , Elasmopoides) , article 1 of palp 

 with medial process or spines or cusp. Species: 18, cosmopolitan, 

 littoral (and 3 bathyal). 



Cheirocratella Stephensen 



Cheirocratella Stephensen, 1940. 



Type-species: C. thori Stephensen, 1940 (original designation). 



Accessory flagellum 2-articulate; [lower lip unknown]; inner plates 

 of maxillae 1-2 apparently densely setose medially; gnathopod 1 

 simple; gnathopod 2 larger and subchelate (only female is known); 

 [uropod 3 unknown]; telson deeply cleft; metasomal and urosomal 

 segments dorsally toothed, urosome with scattered spines; antennae 

 subequal in length (Casco). Species: 1, Iceland, littoral. 



Cheirocratus Norman 



Cheirocratus Norman, 1867a. — Stebbing, 1906. 



Type-species: Gammarus assimilis Liljeborg, 1851 (monotypy 

 and subsequent synonymy). See Sars, 1895. 



