400 Eocene Fossils of the United States. 
ed, the inferior margin truncated obliquely inwards; lateral teeth 
distinct ; the posterior one very short, pyramidal, remote. (Plate 
IV, fig. 10.) (2 
T. alta, Con. ; Foss. Shells of Tert. Form., p. 41. 
Claiborne, Alabama. Very rare. 
In this species one valve is considerably more convex than the 
other, and the anterior muscular impression is rather deeply im- 
pressed, and bounded on the inner side by a broad rib-like eleva- 
tion, which extends to the apex. 
T'eLLINA PLANA. . Scaleniform, very much compressed, very 
inequilateral, smooth and polished; substance of shell very thin; 
beaks very small and pointed; lateral teeth lamellar. (Plate 
IV, fig. 6.) 
Egeria plana, Lea; Cont. to Geol., p. 54, plate i, fig. 25. 
Claiborne, Alabama. 
venet. Suboval, inequilateral, moderately thick, 
concentric lines and with brown bands; 
(Plate V, fig. 1.) 
Claiborne, Alabama. 
Of this species I have only an imperfect right valve. Its most 
remarkable character is the somewhat angulated form of the an- 
terior dorsal margin. It is dedicated to Dr. Ravenel of Charles- 
ton, 8. C. ; 
Tenia scANDULA. Ovate, much compressed; anterior mar- 
gin rounded; ligament margin very oblique, slightly eurved ; 
fold near the posterior margin, angulated, subcarinated ; 
margin rounded; beaks scarcely prominent above the hinge line, 
submedial, nearest the anterior end. (Plate IV, fig. 8.) 
T'. scandula, Con.; Jour. Acad. Nat. Sciences, vol. vii, P 132. 
Claiborne, Alabama. 
I found only one valve, a right one, and this is imperfect ; the 
cardinal plate is broad and thick, with two diverging compressed 
teeth, and no lateral teeth. The substance of the shell is mod- 
erately thick. 
ee Corsis. 
_ The genus Corbis of Cuvier originated in the Eocene period. 
Tr : ‘Species occur in the Paris Eocene, one of which is also 
