124 U.S. NATIONAL MUSEUM BULLETIN 271 



Echiniphimedia K. H. Barnard 



Echiniphimedia K. H. Barnard, 1930. 



Type-species: Iphimedia hodgsoni Walker (see 1907) (present 

 selection) . 



Upper lip entire or slightly emarginate; mandible with narrow, 

 rounded apex; lobes of lower lip not incised or minutely so; palp of 

 maxilla 1 biarticulate, reaching end of outer plate; maxillipedal palp 

 exceeding outer plate, 4-articulate, article 4 extremely minute, article 

 2 scarcely or not produced; gnathopods 1 and 2 chelate; telson with 

 shallow, broad emargination; some or all coxae with submarginal teeth. 

 Species: 3, antarctic, bathyal to littoral (to 824 m). 



Gnathiphimedia K. H. Barnard 



Gnathiphimedia K. H. Barnard, 1930. 



Type-species: G. mandibularis K, H. Barnard, 1930 (present 

 selection) . 



Upper lip entire; mandible short, broad, apex smooth, molar 

 conical; lobes of lower lip not incised; palp of maxilla 1 biarticulate, 

 reaching end of outer plate; maxillipedal palp exceeding outer plate, 

 3-articulate, article 2 indistinctly or not produced; gnathopod 1 

 chelate; telson ?emarginate. Species: 3, antarctic, bathyal (littoral) 

 (to 824 m). 



Iphimedia Rathke 



Iphimedia Rathke, 1843. — Stebbing, 1906. 

 Microcheles Kr0yer, 1846. 



Type-species: /. ohesa Rathke, 1843 (monotypy). See Sars, 1895. 



Upper lip slightly emarginate or truncate; mandible with medium- 

 broad, slightly toothed apex; lobes of lower lip notched; palp of maxilla 

 1 biarticulate, reaching end of outer plate; maxillipedal palp exceeding 

 outer plate, 3-articulate, article 2 produced along article 3; gnathopods 

 both chelate or gnathopod 2 subchelate; telson incised or emarginate. 

 Species: 8, tropical Pacific to antarctic, littoral (one bathyal). 



Iphimediella Chevreux 



IphimedieUa Chevreux, 1911c, 1912a, 1912b. 



Type-species: /. margueritei Chevreux 1912a (designated by 

 Chevreux) ; 1912b. 



Upper lip entire or weakly incised; mandible medium-broad, apex 

 scarcely toothed; lobes of lower lip not incised; palp of maxilla 1 



