42 University of Michigan 



of lincolata Raf. (belonging to Plagiola), and consequently 

 EUipsaria becomes a synonym of Plagiola Raf. Frierson's 

 designation of fasciolaris as the type is absolutely void. Pty- 

 chobranchus Simpson will therefore stand. 



Ptychobranchus fasciolare (Rafinesque), 1820 

 Type locality: Ohio, Wabash, and Kentucky rivers. 



Obliguaria (EUipsaria) fasciolaris Rafinesque, '20, p. 303. 



Unio phaseolus Hildreth, '28, p. 283. 



L''. fasciolaris Raf . = [/. phaseolus Hild., Conrad, '34, p. 69; Ferus- 

 sac. '35, p. 27. 



Ptychobranchus phaseolus (Hild.), Simpson, '00^, p. 613; '14, p. 333. 



Obi. fasciolaris Raf. :=Ptych. pjtaseolus (Hild.), Frierson, '14", p. 7. 



Ptychobranchus fasciolaris (Raf.) ^= Pt. phaseolus (Hild.), Vanatta, 

 '15, p. 554 ("type" examined). 



EUipsaria fasciolaris (Raf.), Ortmann, '18, p. 563. 



Obi. fasciolaris (Rai.) = Ptych. phaseohis (WiW.), Walker, '18^, p. 

 179 ("if identifiable"). 



The first part of the original description of O. fasciolaris 

 Raf. contains nothing that opposes the assumption that this is 

 phaseolus, but it also does not contain anything that clearly 

 indicates this species. However, further on, Rafinesque says 

 that there is a remarkable character in this species, consisting 

 in the presence of several oblique ridges on the inside of the 

 shell. This unquestionably refers to the ridges and depres- 

 sions seen inside of the shell of the female of the genus Pty- 

 chobranchus, and since an Ohio shell is described, this can be 

 only Pt. phaseolus. Thus the specific name fasciolaris stands, 



Obliquaria rEFIvExa Rafinesque, 1820 



Type locality: Kentucky River and Letart Falls (Meigs 



County, Ohio). 



Obliquaria rcflexa Rafinesque, '20, p. 306. 

 Unio cormitus Barnes, '23, p. 122, pi. 4, f. 5. 



(J. reflexus Raf. = [/. cornutus Bar., Conrad, '34, p. 71 ; Ferussac,. 

 '35, p. 28; Conrad, '35, p. 7, pi. 4, f. I. 



