46 University of Michigan 



valid. The other names given by Rafinesque (pusilla and stri- 

 ata) do not need to be considered, since Conrad made already 

 a selection among the available names, choosing suhrotundus. 



Obovaria LENS (Lea), 1831 

 Type locality: Ohio and Tennessee. 



Unio levigata Rafinesque, '20, p. 296, pi. 80, f. 11-13. 



Unio lens Lea, '31, p. 80, pi. 8, f. 10. 



U. Icevigatus Raf . =^ U. lens Lea, Conrad, '34, p. 70. 



Obovaria lens (Lea), Simpson, '14, p. 293. 



Obovaria levigata (Raf.) = O. lens (Lea), Vanatta, '15, p. 552 

 ("types" examined). 



Obovaria subrotunda levigata (Raf.), Ortmann, '18, p. 568. 



Ob. lens (Lea) = U. levigata Raf., Walker, 'i8c, p. 180 ("if identi- 

 fiable"). 



The description and figure of levigafa indicate a strongly 

 transversely-elliptical shell, which does not at all fit lens of 

 Lea, which generally is rather rounded or only very slightly 

 transverse. Thus, without knowledge of what the so-called 

 Poulson-Rafinesque "type" is, nobody would ever suspect that 

 Rafinesque's shell is this. 



Also the character "swollen" (bombee) does not apply to 

 lens^ and levigata must be regarded as not identifiable. 



Obovaria olivaria (Rafinesque), 1820 

 Tvpe locality: Kentucky River. 



Amblema olivaria Rafinesque, '20, p. 314. 



Unio ellipsis Lea, '28, p. 268, pi. 4, f. 4. 



U. olivarius Raf. = U. ellipsis Lea, Conrad, '34, p. 70 ; Ferussac, 35, 

 p. 28-34. 



Obovaria ellipsis (Lea), Simpson, '14, p. 299. 



Ob. olivaria (Raf.) =0. ellipsis (Lea), Vanatta, '15, p. SS2 ("type" 

 examined). 



Ob. ellipsis (Lea) ■= A. olivaria Raf., Walker, 'i8c, p. 180 ("if iden- 

 tifiable"). 



The specific description of olivaria may be applied to ellipsis 



Lea: Shell thick, little convex, oval, elliptic, beaks hardly 



