MARINiE GAMMARIDEAN AMPHIPODA 



263 



Alexandrella, in the Stilipedidae, has a bent first maxillary palp 

 but hyperiopsids have well-developed accessory flagella and mandi- 

 bular molars. 



Key to the Genera of Hyperiopsidae 



1. Coxae 1-4 small, similar in size and shape (fig. 101a) .... Hyperiopsis 

 Coxa 4 greatly enlarged, concealing the small first three coxae (fig. 1016) 



Parargissa 



Figure 102. — Hyperiopsidae: Maxilla 1: a,b, Parargissa arquata (Birstein and \ inogradov, 

 1955); c, Hyperiopsis gihhosa Pirlot (1934); d, otlier palp of Hyperiopsis. Maxilla 2: 

 e, Hyperiopsis. Pereopods 1 and 2:/, Hyperiopsis laticarpa Birstein and Vinogradov 

 (1955); g, Parargissa arquata. Maxilliped: h, Hyperiopsis. 



Genera of Hyperiop sidae 



Hyperiopsis Sars 



Hyperiopsis Sars, 1885. — Stebbing, 1906. 



Type-species: H. voringii Sars, 1885 (monotypy). See Stephensen, 

 1934. 



Species: 7, cosmopelagic, abyssal and bathyal. 



