Eocene Fossils of the United States. 399 
This species is common at Claiborne, and is rematkably like 
C. angustata, Sow.; and is also allied to C. ombonella, Desh., a 
fossil of the Paris Eocene. It was by means of this species that 
I was able to recognize an Hocene deposit on the Washita river, 
Louisiana, as it adhered imbedded in sand to the Zeuglodon 
bones sent from there. At Claiborne it is occasionally found 
with united valves. 
One right valve much larger than usual, from Claiborne, has 
much more numerous, proportionally smaller, and more approxi- 
mate and unequal concentric strie. 
TELLINA. 
The genus T'ellina, Lin., is supposed to be as ancient as the 
Oolitic period. Mr. Phillips describes a species of the Coral Rag, 
but its generic character is uncertain. Deshayes’s table gives fifty 
four tertiary species; eighteen in the Paris Hocene ; four im the 
London clay, and four in the English Miocene. I have discov- 
ered five in the American Eocene and five in the Miocene, one 
of which is a recent speces, (‘7 lusoria.) 'Two recent species 
inhabit the coast of Massachusetts, and a few others are known 
on the southern coast. I found five species in ‘Tampa Bay, 
Florida. The common 7’. radiata inhabits the eastern coast of 
Florida as far north as Fort Lauderdale, above Cape Florida. 
‘Teuuwa Sittamant.  Subtriangular, compressed, thin; left 
valve with a prominent acute fold over the umbonial slope, which 
is straight ; posterior side shorter than the anterior; the dorsal 
line straight and oblique; the end margin obliquely truncated, 
and the extremity truncated; surface marked with brown con- 
centric bands; valve contracted widely from beak to base be- 
tween the middle and umbonial slope. (Plate IV, fig. 9.) 
Claiborne, Alabama. Very rare. 
Teruina pApyrta. Elliptical, subequilateral, very thin and 
compressed, with minute regular concentric impressed lines, ob- 
sdlete on the posterior side; anterior end acutely rounded ; pos- 
terior extremity angulated ; beaks scarcely prominent ; apex acute ; 
cardinal teeth prominent; lateral teeth none. (Plate IV, fig. 7.) 
Tellina papyria, Con. ; Foss. Shells of Tert. Form., p. 41. 
- Claiborne, Alabama. Very rare. 
Trius ata, Suborbicular, inequivalved, inequilateral, with 
lamelliform concentric lines, not closely arranged, and minute 
closely arranged radiating wrinkles ; posterior side obtusely fold- 
