178 U.S. ISTATIONAL MUSEUM BULLETIN 271 



posterior lobe; telson slightly emarginate; yal]) oj maxilla 1 reduced, 

 reaching halfway along outer plate. Species: 4, subarctic, littoral to 

 bathyal (1,500 m). 



Leptarnphopus Sars 



Leptamphopus Sars, 1895. — Stebbing, 1906. 



Type-species: L. sarsi Vanhoffen, 1897 (monotypy; L. sarsi is a 

 new name for Sars' misidentification of Amphithopsis longimana Boeck). 

 For stability, this arrangement should be preserved. 



Antenna 1 slightly longer than antenna 2 ; accessory flagellum absent; 

 lower lip without inner lobes; gnathopodal palms distinct, articles 5 and 

 6 together elongate; telson notched; article 3 of mandibular palp sub- 

 equal to article 2 or very slightly shorter, relatively slender, falcate or 

 pointed (Oradarea); outer ramus of uropod 3 half as long as inner 

 (Bouvierella) . Species: 2, ?amphiboreal, bipolar, littoral to bathyal 

 (1,505 m). 



Metaleptamphopus Chevreux 



M etaleptamphopus Chevreux 1911c; 1912a; 1912b. 



Type-species: M. pectinatus Chevreux, 1912a (designated by 

 Chevreux); 1912b. 



Antenna 1 longer than antenna 2; accessory flagellum absent (type) 

 or uniarticulate; lower lip without inner lobes; gnathopodal palms 

 scarcely distinct, articles 5 and 6 equal, together not elongate; article 5 

 lacking posterior lobe; telson rounded; dactyls of pereopods strongly 

 pectinate. Species: 2, littoral subantarctic to S. Atlantic bathyal 

 (537 m). 



Oradarea Walker 



Oradarea Walker, 1903.— Shoemaker, 1930. 



Type-species. — 0. walkeri Shoemaker, 1930 (monotypy; 0. walkeri 

 is new name for Walker's 0. longimana which is a homonym of Boeck's 

 Amphithopsis longimana later transferred to Oradarea) . 



Antenna 2 probably longer than antenna 1 ; accessory flagellum 

 cylindrical but shorter than article 1 of primary flagellum; lower 

 lip with inner lobes; gnathopodal palms distinct, articles 5 and 6 

 together elongate; telson truncate, rounded but with minute notch 

 or apically pyramidal; article 3 of mandibular palp short, stout, two 

 thirds as long as article 2 {Leptamphopus). Species: 9, primarily 

 antarctic (6), one bathyal Indonesia, one boreal, littoral to bathyal 

 (1,165 m). 



Regalia K. H. Barnard 



Regalia K. H. Barnard, 1930. 



Type-species: R. fascicularis K. H. Barnard, 1930 (monotypy). 



