194 U.S. NATIONAL MUSEUM BULLETIN 271 



coxae short, scarcely touching serially; male gnathopod 1 large, 

 carpochelate, article 5 bearing a tooth (or two), article 6 simple, 

 gnathopod 2 smaller, normally subchelate or slightly chelate, and 

 articles 4-5 sometimes like Corophium; uropod 2 biramous; iiropod 3 

 with its single ramus longer than peduncle. Species: 15, circum- 

 tropical and warm-temperate, littoral, especially brackish water. 

 Differs from Neomicrodeutopus in Aoridae by elongate article 1 of 

 mandibular palp, that article as long as article 2. 



Kamaka Derjavin 



Kamaka Derjavin, 1923. — Gurjanova, 1951. 



Type-species: K. kuthae Derjavin, 1923 (monotypy). 



Accessory flagellum absent; antenna 1 short, article 3 slightly 

 shorter than article 1, flagellum equal to peduncle; antenna 2 much 

 longer than antenna 1, slender, flagellum equal to or shorter than 

 article 5, often about 2-articulate ; mandibular palp 3-articulate; coxae 

 of medium size, touching serially; gnathopods normally subchelate and 

 male gnathopod 2 with large palmar tooth; uropod 2 biramous; uropod 

 3 with its single ramus slightly shorter than (or subequal to) peduncle; 

 pleonites 4-5 coalesced. Species: 3, boreal N. W. Pacific, littoral. 



Neohela Smith 



Hela Boeck, 1861 (homonym, Decapoda). 

 Neohela Smith, 1881 (new name). — Stabbing, 1906. 

 Helella Sars, 1882. 



Type-species: Hela monstrosa Boeck, 1861 (monotypy). See Sars, 

 1895. 



Accessory flagellum multiarticulate; article 3 of antenna 1 longer 

 than article 1, flagellum longer than peduncle; antenna 2 slender, 

 slightly longer than 1, flagellum longer than peduncle; mandibular 

 palp 3-articulate; coxae short, some sharp, not touching serially; 

 gnathopods normally subchelate, gnathopod 1 slightly larger than 

 gnathopod 2; uropod 2 biramous; uropod 3 with its single ramus equal 

 to or twice as long as peduncle; telson slightly enlarged and apparently 

 coalesced with urosomite 3; inner plate oj maxilla 1 with about jive setae 

 mostly terminal (Parunciola) . Species: 3, subarctic-boreal, littoral to 

 abyssal (2,288 m). 



Paracorophium Stebbing 



Paracorophium Stebbing, 1899b, c; 1906. 



Type-species: Corophium excavatum Thomson, 1884 (monotypy). 

 See Hurley, 1954b. 



