Catalogue Recently Described Moelusca 171 



Genus AMBLEMA Rafinesqiie, 1820. 



Amhlema Rafinesque, Monographie, 1820, p. 314. 



Crenodcnta Schluter, Verz. meiner Conch., 1836, p. 33; Simpson, Syn., 



1900, p. 766; Desc. Cat., 1914, p. 813. 

 Type: Aiublciiia cosfafa Raf. 



Genus MEGALONAIAS Utterback, 191 5 



M cci'donalas Utterback, Amer. Mid. Nat., IV, 191 5, p. 123. 

 Type: Unio heros S^y. 



Genus ROTUNDARIA Rafinesque, 1820. 



Rotundaria Rafinesque, Monographie, 1820, p. 308; Simpson, Syn., 1900, p. 



794; Desc. Cat., 1914, p. 903. 

 Type : Obliqnaria tiihcrculata Raf. 



Genus FUSCONAIA Simpson, 1900. 



Fusconaia Simpson, Syn., 1900, p. 784; Desc. Cat., 1914, p. 865. 

 Type: Unio trigonus Lea. 



Genus PLETHOBASUS Simpson, 1900. 



PlethobasKs Simpson, Syn., 1900, p. 764; Desc. Cat., 1914, p. 805. 

 Type : Unio crsopus Green. 



Genus PLEUROBEMA Rafinesque. 

 PeEurobema .^sopus (Green). 



This species has been referred to Obliquaria cyphya Raf. by Conrad, 

 Call, Ortmann and others. Vanatta (140, p. 556) states that the shell in 

 the Poulson collection so labelled is this species. If identifiable from the 

 original description, cyphya would have priority. 



This species is the type of Simpson's section PlcfJiobasiis, which Ort- 

 mann (79, p. 259) has raised to generic rank. 



PlEurorema argenteum pannosum Simpson. 



This is a Fusconaia and a synonym of F. o::arkc}isis (Call) according to 

 Ortmann (84, p. 63). 



'\ 

 Pleurobema barnesianum (Lea). 



Is -a. Fusconaia and includes mercdithii Lea, pudicum Lea, lyonii I,ea. 

 telUcoensis Lea and Icnticulare Lea according to Ortmann (84, p. 59). 



