MARINE GAMMARIDEAN AMPHIPODA 393 



Nomenclatural Changes in Paramphithoidae 



Amathillopsis Heller (1875) is removed from Gammaridae and 

 AmathUlopsidae and assigned to Paramphithoidae, thus resulting 

 in amalgamation of Amathillopsidae with Paramphithoidae. 



Amathillopleustes Pirlot (1934) is a synonym of Cleonardopsis K. H. 

 Barnard (1916) and they are removed to the Eusiridae. 



Oradarea Walker (1903) is removed to the Calliopiidae. 



Parepimeriella Schellenberg (1931) is removed to the Pleustidae. 



Key to the Genera of Paramphithoidae 



1 . Body densely covered with articulate spines (see frontispiece) . Uschakoviella 

 Body lacking articulate spines 2 



2. Molar of mandible absent Bathypanoploea ' 



Molar of mandible only a setose lamina or cone (fig. 142p) 3 



Molar of mandible well developed, large, ridged (fig. 142j) 4 



3. Pereopod 5 as long as or longer than pereopod 4 Eclysis 



Pereopod 5 shorter than pereopod 4 Epimeriella 



4. Maxillipedal palp bearing only three articles ^ (fig. 142g) 5 



Maxillipedal palp bearing four articles (fig. 142n) 6 



5. Lower lip with inner lobes (fig. 142o) Parepimeria ^ 



Lower lip lacking inner lobes (fig. 142/c) Metepimeria 



6. Coxae 4-5 together forming a crescentic curve below (fig. 141a) . . . . 7 * 

 Coxae 4-5 together not forming a crescentic curve below (fig. 1406) ... 8 



7. Gnathopods subchelate, dactyl slender, simple (fig. 1426) . . . Epimeria * 

 Gnathopods simple, dactyl stout, spinose (fig. 142e) . . . Pseudepimeria * 



8. Accessory flagellum present 9 



Accessory flagellum absent 10 



9. Accessory flagellum long and spiniform, gnathopods strongly subche- 



late Amathillopsis 



Accessory flagellum short, scale-like or barrel-like, gnathopods simple 



even though portions occasionally stout Parepimeria 



10. Article 5 of gnathopods shorter than article 6 Paramphithoe ^ 



Article 5 of gnathopods much longer than article 6 . . . . Actinacanthus 



• Assigned to Acanthonotozomatidae provisionally. 

 ^Chevreux (1912b). 



' K. H. Barnard (1932) states maxillipedal palp article 4 is present. 



* Note resemblance in coxae 4-5 of Weyprechtia (Gammaridae). 



' See also Halirages stebbingi Schellenberg (1931) (.=H. huxleyanus Stebbing, 1888, not Bate), in the Callio- 

 piidae, a species with acuminate anterior coxae; it differs from paramphithoids and other members of Hali- 

 rages in its stout gnathopods with ovate articles. 



Genera of Paramphithoidae 



Actinacanthus Stebbing 



Acanthechinus Stebbing, 1888 (homonym, Echinodermata). 

 Actinacanthus Stebbing, 1906 (new name). 



