Oct. 1847.] 297 



Descriptions of New Eocene Fossils in the Cabinet o/Lardner VaNUXkm. 



The following organic remains were obtained from Eocene rocks in St. Mat- 

 thew's Parish, Orangeburg District, S. C, by Lardner Vanuxem. 



1. Nucula mucronala. 



Elliptical, convex in the middle, with equal, laminated, not closely-arranged 

 lines, about seventeen in number ; anterior side longest, the end acutely pointed ; 

 a submarginal furrow emarginates the base; posterior side slightly contracted, 

 end obtusely rounded or subtruncated. Length 9-10. Height 5. 



2. Nucula carolinensis. 



Somewhat elliptical, convex, with rather closely-arranged prominent concen- 

 trie lines, wanting on the posterior side, which is rather shorter that the an- 

 terior and regularly rounded at the end ; anterior submargin with a narrow 

 groove, bounded^by a subcarinated line ; anterior side narrowed and rather ob- 

 tuse at the end. Length \. Height \. 



3. Nucula subtrigona. 



Subtriangular, ventricose, nearly equilateral, with numerous prominent con- 

 centric lines ; anterior side pointed, flexuous ; submargin angulated : anterior 

 margin sinuous, end angular; ligament margin straight; basal margin pro- 

 foundly rounded. Length f. Height i nearly. 



4. Nucula calcarensis.. 



Subovate, ventricose, with minute closely-arranged concentric lines ; ante- 

 rior side longest, pointed, slightly recurved, without a submarginal groove or 

 fold; base profoundly rounded. Length 7-16. Height . 



1. Cardita vigintinaria. 



Suborbicular, inequilateral, ventricose, with about thirty square radii, about 

 as wide as the interstices ; umbonial slope rounded ; anterior margin subtrun- 

 cated. Length 7-8. Height 7-8. 



2. Cardita carolinensis. 



Suborbicular ? profoundly ventricose, with about thirty very prominent 

 square radii, on the anterior side sharp, recurved and crenulated ; lunule very 

 broad and cordate, deeply impressed ; hinge thick ; pit anterior to the cardi- 

 nal tooth small and profound. 



This is a fragment of the right valve, about 5-8ths of an inch long. 



3. Cardita bilineata. 



Subrhomboidal, very inequilateral, with about twenty-four wide, flattened 

 radii, with very narrow interstices, a carina in the middle of each rib, with 

 an impressed line on each side of it ; ribs crenulated anteriorly ; carina some- 

 what tuberculated on the posterior side of the shell. Length f . Height 9-16. 



