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 subrotundus. 
OBOVARIA LENS (Lea), 1831 
Type locality: Ohio and Tennessee. 
Unio levigata Rafinesque, ’20, p. 296, pl. 80, f. 11-13. 
Unio lens Lea, ’31, p. 80, pl. 8, f. Io. 
U. levigatus Raf. =U. lens Lea, Conrad, ’34, p. 70. 
Obovaria lens (Lea), Simpson, 714, 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, ’18¢, p. 180 (“if identi- 
fiable”). 
The description and figure of levigata 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” (bombée) does not apply to 
lens, and levigata must be regarded as not identifiable. 
OBOVARIA OLIVARIA (Rafinesque), 1820 
Type locality: Kentucky River. 
Amblema olivaria Rafinesque, °20, p. 314. 
Unio ellipsis Lea, ’28, p. 268, pl. 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.) =O. ellipsis (Lea), Vanatta, "15, p. 553 (“type” 
examined). 
Ob. ellipsis (Lea) = A. olivaria Raf., Walker, ’18¢, p. 180 (“if iden- 
tifiable’’). 
The specific description of olivaria may be applied to ellipsis 
Lea: Shell thick, little convex, oval, elliptic, beaks hardly 
