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OSTREA RADIANS. Tab . 13, fig. 1. 
Oblong, compressed, lobed and flexuous on one side; the ribs 
numerous, radiated; beaks very small, not prominent, pointed 
and a little curved laterally. 
Localities. Vance’s Ferry, S. C.; Claiborne, Alab. Mid- 
dle Tertiary. 
This elegant species, remarkable for the regularity of the 
ribs, was found in the former of these localities by my friend 
Dr. Blanding, and others have come under my observation, from 
Claiborne, where they form an entire bed or stratum, but are 
almost all in fragments, firmly united by a calcarious cement. 
OSTREA SELLiEFORMIS. Tab. 13, fig. 2. 
Oblong, convex, thick and ponderous, lobed; one side of the 
larger valve profoundly sinuous and the opposite side gibbous; 
smaller valve sinuous and little convex; dorsal margin long and 
slightly arched, with both extremities obtusely rounded. 
Localities. Claiborne, Alab. Middle Tertiary. 
This singular shell does not vary greatly in its outline, and 
is very unlike any other species of this country with which we 
are acquainted. It is often extremely thick and ponderous. 
OSTREA CAROLXNENSIS. Tab. 14, fig. 1. 
Obovate, oblique, thick, compressed; superior valve flat; in- 
ferior valve convex, with concentric imbricated laminae which 
are transversely plicated; beaks broad and prominent; fosset 
large and defined by broad prominent lateral ridges. 
Locality. Santee Canal, S. C. 
A large and handsomely plicated oyster, having considerable 
resemblance to O. compressirostra of Say, but the beaks in that 
species are very small and compressed, whilst in the former 
they are broad and prominent, and the shell attains a greater 
size and thickness with an approach to a falcate form. 
