172 Bryant Walker 



Plkx'R015f;ma bigbyi;nse; (Lea). 



Is a Fiisconaia and a variety of P. barnesiana (Lea) and includes esta- 

 brookianuni Lea, fassinans Lea and fass'inans rlwniboidea Simp, according 

 to Ortmann (84, p. 59). 



PlEurobEma breve subellipticum Simpson. 



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

 mann (84, p. 63). 



PeEurobema ceavus (Lamarck). 



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

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

 21, pi. 10, fig. 3. 

 Vanatta (140, p. 555) states that Uino elliptica Raf., Ohliquaria scal- 

 enia Raf. and Plenrohema cuneata Raf. as labelled in the Poulson collection 

 are this species and expresses the opinion that Pleiirobema mytiloides Raf. 

 is also. 



Peeijrobema conradi 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 hy 

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

 specific name for the PI. maculatum (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, edgarianmn Lea or some other species of that group. 



PeEurobema crudum (Lea). 



Is a synonym of Fusconaia barnesiana tumescens (Lea) according to 

 Ortmann (84, p. 59). 



PeEurobema estabrookianum (Lea). 



Is a Fusconaia and a synonym of F. barnesiana bigbyensis (Lea) accord- 

 ing to Ortmann (84, p. 59). 



PeEurobema doeeabeeeoides (Lea). 



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

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



