298 [Oct. 1847. 



4. Cardita subquadrata. 



Trapezoidal, compressed ; valves flattened in the middle ; radii about twenty- 

 five, broad on the disk, with very narrow interstices, and each rib with a crenu- 

 lated carina in the middle ; posterior to umbonial slope the ribs are smooth, not 

 carinated ; anterior side short, rounded at the end ; posterior margin obliquely 

 truncated. Length 6-10. Height 7-20. 



5. Cardita subrotunda. 



Orbicular, inequilateral, ventricose, with about twenty-eight rounded promi- 

 nent narrow radii ; ligament margin very oblique, short ; ends obtusely rounded 

 inner margin slightly crenulated. Length J. Height J. 



Turbo biliratus. 



Turbinate ; volutions four, flattened above ; body whorl with two distant 

 revolving carinated lines, and intermediate fine revolving lines ; volutions of 

 the spire with a carinated line below the middle. Length f . Width f . 



1. Cerithium bicostellatum. 



Turreted ; volutions eight or nine, angular and carinated below the middle > 

 body whorl bicarinated. Length f. 



2. Cerithium siliceum. 



Turreted ; whorls rounded below, contracted or concave above, and with re- 

 volving lines ; suture profound. A fragment. Width . 



Infundibulum carinatum. 



Depressed, with a suddently elevated acutely conical spire, and a carinated 

 line revolving at the suture. -Length of fragment f . 



All the preceding fossils are from the Eocene rocks of St. Matthew's Parish, 

 Orangeburg District, S. C. Not one species of this locality is known in the 

 lower Eocene of Claiborne or elsewhere, nor in the upper Eocene of Vicksburg, 

 and therefore the relative age of the deposit is uncertain, but it unquestionably 

 belongs to the Eocene period. .Near this rock Mr. Vanuxem found quite a dif- 

 ferent class of shells, consisting of casts in indurated clay. The relative posi- 

 tion is undetermined. Two of the shells are described and named Tellina sub- 

 equalis and Lutraria petrosa. 



Tellina subequalis. 



Somewhat elliptical, nearly equilateral ; posterior end acutely rounded ; an- 

 terior slightly bent, end rounded. (A cast.) Length \\. Width f. 



Madrepora punctulata. 



Cylindrical, ramose with prominent cells ; whole surface ornamented with 

 fine, equal, punctate, impressed lines. Diameter J. 



Locality. St. Mathew's Parish, Orangeburg, S. C. Vanuxem. 



A species highly ornamented by the punctate vermicular lines. It occurs 

 much larger than the speeimen described. 



In Vanuxem's collection there is a cast, from the Eocene near Long Branch, 



