MARINE GAMMARIDEAN AMPHIPODA 449 



Mandibular palp 2- or 3-articiilate; palp of maxilla 1 imiarticulate; 

 article 2 of pereopods 4-5 expanded; accessory Jiagellum absent {Pro- 

 metopa). Species: 49, subarctic-boreal, littoral to abyssal, (one species 

 Prometojja tubercvlata is subantarctic). 



Metopella Sars 



Metopella Sars, 1985.— Stebbing, 1906. 



Type-species: Aletojja longimana Boeck, 1871 (selected by Gur- 

 janova, 1938). See Sars, 1895. 



Mandibular palj^ 2- or 3-articulate; palp of maxilla 1 uniarticulate ; 

 article 2 of pereopods 4-5 linear. Species: 8, arctic-boreal, littoral. 



Metopelloides Gurjanova 



Metopelloides Gurjanova, 1938, 1951. 



Type-species: Metopella micropalpa Shoemaker, 1930 (original 

 designation). 



Mandibular palp 1-articulate; palp of maxilla 1 uniarticulate; 

 article 2 of pereopods 4-5 linear. Species: 9, arctic-boreal, littoral. 



Metopoides Delia Valle 



Metopoides Delia Valle, 1893.— Stebbing, 1906. 



Type-species: Metopa magellanica Stebbing, 1888 (selected by 

 Gurjanova, 1938). 



Mandibular palp 2- or 3-articulate; palp of maxilla 1 biarticulate ; 

 article 2 of pereopods 4-5 expanded; accessory Jiagellum 1-articulate 

 (Proboloides) . Species are combined with Proboloides; most Meto- 

 poides are subantarctic. 



Microstenothoe Pirlot 



Microstenothoe Pirlot, 1933b. 



Type-species: M. ascidiae Pirlot, 1933b (original designation). 



Mandibular palp absent; pal]) of maxilla 1 biarticulate; article 

 2 of pereopods 4-5 expanded; accessory Jiagellum 1-articulate (Steno- 

 thoe). Species combined with Stenothoe. 



Parametopa Chevreux 



Parametopa Chevreux, 1901b. 



Type-species: P. kervillei Chevreux, 1901b (original designation). 

 See Chevreux and Fage, 1925. 



Mandibular palp absent; palp of maxilla 1 vmiarticulate; article 2 

 of pereopods 4-5 expanded. Species: 3, subarctic and warm-temper- 

 ate in Atlantic, littoral. 



