272 U.S. NATIONAL MUSEUM BULLETIN 271 



biramoiis, rami equal to each other, variable in length, generally 

 equal to or longer than peduncle. Species: 53, cosmopolitan, littoral 

 to bathyal. 



Subgenus Audulla Chevreux (1901a): Like Gammaropsis but 

 flagellum of antenna 2 stout. Species: 1, tropical Indian Ocean, 

 littoral. 



Subgenus Pseudeurystheus Schellenberg (1931): Like Gammaropsis 

 but article 5 of male gnathopod 2 at least 1.6 times as long as article 6. 

 Species: 1, subantarctic, littoral to 310 m. 



Goesia Boeck 



Goesia Boeck, 1871.— Stebbing, 1906. 



Type-species: Autonoe depressa Goes, 1866 (monotypy). See 

 Stephensen, 1942, 1944a. 



Accessory flagellum absent; article 3 of antenna 1 shorter than ar- 

 ticle 1; gnathopods subchelate, gnathopod 2 poorly; uropod 3 short, 

 biramous, rami equal to each other, subequal to peduncle. Species: 

 1, arctic-subarctic, littoral. 



Haplocheira Haswell 



Haplocheira Haswell, 1880b.— Stebbing, 1906. 



Type-species: Gammarus barbimanus Thomson, 1879 (monotypy 

 and subsequent synonymy). See Stebbing, 1888. 



Accessory flagellum 2- or more articulate; article 3 of antenna 1 

 shorter than article 1; gnathopods simple; uropod 3 biramous, outer 

 ramus subequal to peduncle, inner ramus very short. Species: 3, 

 subantarctic-antiboreal, littoral to bathyal (457 m). 



Isaea Milne Edwards 



Isaea Milne Edwards, 1830.— Stebbing, 1906. 



Type-species: /. montagui Milne Edwards, 1830 (monotypy). See 

 Chevreux and Fage, 1925. 



Accessory flagellum 3- or more articulate; article 3 of antenna 1 

 equal to article 1 in length; gnathopods subchelate; uropod 3 biramous, 

 rami equal to each other, slightly longer than peduncle; pereopods 

 1-5 slightly prehensile or subchelate, or article 6 widened distally. 

 Species: 4, N. Atlantic, littoral, some species inhabit decapods. 



Kerrnystheus J. L. Barnard 



Kermysthens J. L. Barnard, 1962a. 



Type-species: Podoceropsis kermadeci Stebbing, 1888 (original 

 designation). 



