206 U.S. NATIONAL MUSEUM BULLETIN 271 



Lower lip with well-developed inner lobes, mandibular processes 

 absent; palp of maxilla 1 biarticulate, article 2 short (Anatylus) except 

 in G. petalocera Ruffo; maxillipedal palp 4-articulate, inner plates 

 vestigial, bud-like; coxa 5 larger than anterior coxae {Anatylus). 

 Species: 3, boreal-tropical in N. and E. hemispheres, littoral. 



Paradexamine Stebbing 



Paradexamine Stebbing, 1899d; 1906. 



Type-species: Dexamine pacifica Thomson, 1879 (original designa- 

 tion). See Stephensen, 1927. 



Lower lip with well-developed inner lobes, mandibular processes 

 distinct; palp of maxilla 1 uniarticulate ; maxillipedal palp 4-articulate, 

 inner plates of moderate size. Species: 9, antarctic-antiboreal, littoral. 



Polycheria Haswell 



Polycheria Haswell, 1880c. — Stebbing, 1906. 



Type-species: Dexamine antarctica Stebbing, 1875 (present selec- 

 tion, denoted by synonymy of Chilton, 1912). See Stebbing, 1888 (as 

 Tritaeta antarctica and T. kergueleni) . 



Lower lip with well-developed inner lobes, mandibular processes 

 absent; palp of maxilla 1 ?biarticulate (uniarticulate =auct. other 

 than Stebbing) ; maxillipedal palp 4-articulate, inner plates weU 

 developed; pereopods cheliform. Species: 4, Antarctic to N. Pacific, 

 littoral. 



Syndexamine Chilton 



Syndexamine Chilton, 1914. 



Type-species: aS'. carinata Chilton, 1914 (monotypy). 



Lower lip with small but distinct inner lobes, mandibular processes 

 absent; palp of maxilla 1 uniarticulate; maxillipedal palp 4-articulate, 

 inner plates small. Species: 1, New Zealand, littoral. 



Tritaeta Boeck 



Lampra Boeck, 1871 (homonym, Lepidoptera) . 

 Tritaeta Boeck, 1876 (new name). — Stebbing, 1906. 



Type-species: Atylus gibbosus Bate and Westwood, 1863 (mono- 

 typy). See Sars, 1895. 



Lower lip with tiny inner lobes, mandibular processes distinct; 

 palp of maxilla 1 uniarticulate; maxillipedal palp 3-articulate, inner 

 plates well developed ; article 4 of pereopod 5 longer than articles 5-6 

 combined {Dexamine). Species: 2, E. Atlantic, littoral. 



