172 Bryant Walker 



PLKUROiiKMA BiGBvKNSK (Lea). 



Is a Pnsconnia and a variety of F. barncsiana (Lea) and includes csta- 

 bi'ookianwn Lea, fassiiunis Lea and fassiiians rhoiiiboidca Simp, according 

 to Ortmann (84, p. 59). 



PlKurobEma r.REvt; subellipticum Simpson. 



Is a Fusconaia and a synonym of F. ozarkcnsis (Call) according to Ort- 

 mann (84, p. 63). 



PlEurobema ceavus (Lamarck). 



Unio consanquineus De Gregorio, Moll, di aq. dul. di Amer., 1914, p. 16. 

 Unio anaticulus ohiensis De Gregorio, Moll, di aq. dul. di Amer., 1914, p. 

 21, pi. 10, fig. 3. 



Vanatta (140, p. 555) states that Unio elliptica Raf., Obliqiiaria scal- 

 cnia Raf. and Pleurobcma cnncata Raf. as labelled in the Poulson collection 

 are this species and expresses the opinion that Pleurobcma niyfiloides Raf. 

 is also. 



PlEurobema conradt Vanatta. 



This species was originally described by Conrad as Unio maculatus, but, 

 as shown by Vanatta (140, p. 559), that name had already been used by 

 Rafinesque for a variety of his Unio nigra and he has proposed conradi as a 

 specific name for the PI. macidatmn (Con.) of Simpson's Desc. Catalogue. 



PlEurobema cor (Conrad). 



The types of this species came from the Flint and Elk rivers in northern 

 Alabama and as Frierson (44, p. 102) has shown is closely related to, if 

 not identical with, edgarianum Lea or some other species of that group. 



PlEurobema crudum (Lea). 



Is a synonym of Fusconaia barncsiana tiimcsccns (Lea) according to 

 Ortmann (84, p. 59). 



PlEurobema estabrookianum (Lea). 



Is a Fusconaia and a synonym of F. barncsiana bigbycnsis (Lea) accord- 

 ing to Ortmann (84, p. 59). 



PlEurobema DOLLABELLOiDEs (Lea). 



Unio tornhatonii duckensis De Gregorio, Moll, di aq. dul. di Amer., 1914, 

 p. 20, pi. II, figs. 2a-c. 



