392 U.S. NATIONAL MUSEUM BULLErTIN 271 



confounds the distinctions between the two families. I include that 

 genus also in the key of Paramphithoidae although retaining Schellen- 

 berg's (1931, 1939) assignment of it to the Acanthonotozomatidae. 



A few paramphithoids like Amathillopsis grevei J. L. Barnard (1961) 

 have very weak acuminations on coxae 1-4 and might be keyed into 

 the Calliopiidae. Cleippides of the latter family may also have sub- 

 acuminate coxae. 



The Lepechinellidae differ from Paramphithoidae mainly by the 

 slender second articles of pereopods 3-5, the possession of coalesced 

 inner lobes on the lower lip, and apparently the fusion of pleonites 

 5 and 6. 



The genus Amathillopleustes Pirlot (1934) described in the Amathil- 

 lopsidae was preoccupied by Cleonardopsis K. H. Barnard (1916). 

 Since this genus bears rounded coxae it cannot be retained in the 

 Paramphithoidae (=Amathillopsidae); it bears an elongate 1-artic- 

 late accessory flagellum and cleft telson, hence should be transferred 

 to the Eusiridae. Note that the Eusiridae and Pontogeneiidae have 

 been amalgamated. 



The Pleustidae are very closely related to Paramphithoidae but have 

 characteristic lower lips. Mesopleustes is an intermediate genus because 

 of its weakly pleustid lower lip and tendency to coxal acumination. 



Haustoriids have a well-developed accessory flagellum and fossorial 

 appendages. 



Eusiridae lack fully acuminate coxae. Rhachotropis, however, 

 intergrades Eusiridae and Paramphithoidae. 



Oradarea Walker, originally described in the Calliopiidae but 

 transferred to Paramphithoidae by Pirlot (1934) usually lacks the 

 pointed coxae of paramphithoids although male 0. shoemakeri Pirlot 

 has slightly acuminate coxae, Oradarea should be returned to the 

 Calliopiidae. Parepimeriella Schellenberg (1931) also has rounded, 

 untapering coxae, bears the lower lip characteristic of Pleustidae, and 

 should be transferred to that family. 



Eclysis K. H. Barnard (1932) and Epimeriella Walker (1907) 

 probably should be assigned to the Astyridae and the Paramphithoidae 

 amended to include only genera with triturative molars. Eclysis is 

 particularly close to Astyra, differing from the latter in the absence 

 of an accessory flagellum. 



One species of Gammaridae, Weyprechtia heuglini (Buchholz), has 

 coxae 4-5 forming a ventral crescentic curve like some paramphithoids 

 but that genus may be distinguished in its multiarticulate accessory 

 flagellum. 



