ot a ee 
gant 
Eocene Fossils of the United States. 213 
8 
ted; posterior margin regularly rounded ; ambonial slope defined 
by impressed lines; concentric lines onthe anterior half of the 
shell rough and prominent; basal margin slightly arched. (Plate 
I, fig. 5.) ses | 
Claiborne, Alabama 
This rare species is allied to F. elongata, Desh. ; but is propor- 
tionally shorter and very distinct. 
Baranvs. 
One species of this genus occurs in the Eocene limestone of 
South Carolina, and I know none of earlier date. ‘The large 
Miocene Pectens are frequently covered with large and small spe- 
cies. Six recent Balani have been described as inhabitants of 
the Atlantic coast, of which, one only, B. ovularis, has been dis- 
covered in the miocene. 
Bauanus perecrinus. Subovate; valves longitudinally stria- 
ted and obscurely sulcated transversely ; the large valves curved 
towards the narrow end of the aperture ; aperture large, acutely 
ovate. (Plate I, fig. 6.) 
Balanus peregrinus, Morton; Synopsis of Organic Rem. of 
Cretac. Group, p. 72, Plate X, fig. 5. 
Near Santee canal, South Carolina. 
This shell is remarkably perfect and retains part of its original — 
reddish color. 1 discovered it in white friable limestone, between 
Charleston and the Santee canal. 
PuHo.as. 
The genus Pholas has been discovered by Sowerby and Phil- 
lips, in the coral rag, Kimmeridge clay and gault. ‘The oldest 
species known in this country, is the one I found in the Eocene. 
There is one other species in the Miocene strata of Virginia. 
Deshayes enumerates nine in the European tertiaries, three of 
which belong to the Paris Eocene. We find five recent species 
on the coasts of the United States, two of which are limited to 
the southern coast. 
Puonas perrosa. Ovate-acute; anteriorly profoundly ventri- 
cose, the extremity truncated, not very obliquely ; posterior side 
cuneiform; surface with numerous acute unequal radii; dorsal 
margin declining, subrectilinear ; basal margin nearly rectilinear. 
(Plate II, fig. 1.) 
