UNIO 663 
Unio invenustus Lea, Pr. Ac. N. Sci. Phila., III, 1873, p. 424; 
fieAc IN sciv Phila. VII, 13874, p. 66, pl. xxi, hg. 62; 
Ops. Sell 1674, p. 70; pl. xxi, fig. 62. 
Unio gesnerti Lea, Pr. Ac. N. Sci. Phila., III, 1874, p. 424; Jl. 
Wee Ne-Ser enitas, V UL 1874, p05, pl. xxl, hg. 61; Obs., 
XIII, 1874, p. 60, pl. xxu, fig. 61.—Sowrrsy, Conch. Icon., 
XVI, 1868, pl. Lxxx1y, fig. 446. 
An abundant and somewhat variable form. I have thrown 
together under the name Unio tuomeyi a number of so-called 
species, some of which seem to be absolutely identical. In 
general this form is somewhat elongated, subcompressed or 
only moderately inflated, and it has a rather smooth, shining, 
though not brilliant, brownish, rayed or rayless epidermis. It 
is not so rhomboid as rostrum, is rarely arcuate. is not so 
sulcate as that form and does not have quite so high a pos- 
terior ridge. The epidermis is rarely a little roughened. 
UNIO OCMUI,CFENSIS J,ea. 
Shell usually long ovate or elliptical, rarely subrhomboid, 
convex or subinflated, solid, inequilateral; beaks not full or 
high, their sculpture not observed ; posterior ridge full, round- 
ed, sometimes double behind, ending at or below the median 
line in a blunt point or biangulation; anterior end often sub- 
truncate; surface with irregular growth lines; epidermis dark 
ereenish-brown to almost black, lighter and rayed in the young 
shell: left valve with two strong, ragged pseudocardinals, and 
two heavy laterals; right valve with one pseudocardinal, often 
with vestiges of one in front and another behind it, with one 
lateral; muscle scars large, impressed; beak cavities shallow ; 
nacre lurid purplish, somewhat shining. 
Length ro4, height 51, diam. 32 mm. 
Georgia. 
Type locality, Little Ocmulgee River, Lumber City, Ga. 
Unio ocmulgeensis Lea, Pr. Ac. N. Sci. Phila., V, 1861, p. 38; 
jl. Ac. N. Sci. Phila., V, 1862, p. 95, pl. xiv, fig. 243; Obs., 
VIII, 1862, p. 99, pl. xiv, fig. 243—Simrson, Pr. U. S. Nat. 
Mus., XV, 1892, p. 424, pl. Lxvu, fig. 5; Syn., 1900, p. 727. 
Marzaron (Unio) ocmulgeensis.LYA, Syn., 18 
