128 MR. tONRAD'S DESCRIPTIONS 



APPENDIX. 



Descriptions of New Eocene Fossils in the Cabinet of Lardner Vanuxem. 



The following organic remains were obtained from Eocene rocks in St. Matthew's 

 Parish, Orangeburg District, South Carolina, by Lardner Vanuxem. 



NUCULA. 



N. MUCRONATA. PI. 14, fig. 2. — 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 6. 



N. CAROLiNENsis. PI. 14, fig. 3. — Somewhat elliptical, convex, with rather closely-arranged prominent 

 concentric lines, wanting on the posterior side, which is rather shorter than the anterior and regularly 

 rounded at the end ; anterior submargin with a narrow groove, bounded by a subcarlnated line ; 

 anterior side narrowed and rather obtuse at the end. Length 2. Height \. 



N. suBTRiGONA. PI. 14, fig. 4. — Subtriangular, ventricose, nearly equilateral, with numerous prominent 

 concentric lines ; anterior side pointed, flexuous ; submargin angulated : anterior margin sinuous, end 

 angular; ligament margin straight; basal margin profoundly rounded. Length S. Height i nearly. 



N. CALCARENSis. PI. 14, fig. 5. — Subovate, ventricose, with minutely closely-arranged concentric lines : 

 anterior side longest, pointed, slightly recurved, Avithout a submarginal groove or fold ; base 

 profoundly rounded. Length 7-16. Height 4. 



CARDITA. 



C. viGiNTiNARiA. PI. 14, fig. 12. — Suborbicular, inequilateral, ventricose, with about thirty square radii, 

 about as wide as the interstices; umbonial slope rounded ; anterior margin subtruncated. Length 7-8. 

 Height 7-8. 



C. 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 cardinal tooth small and profound. 



This is a fragment of the right valve, about five-eio^hlhs of an inch long. 



C. BiLiNEATA. PI. 14, fig. 9. — 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 somewhat tuberculated on the posterior side of the shell. 

 Length |. Height 9-16. 



C. SUBQUADRATA. PI. 14, fig. 10. — Trapezoidal, compressed; valves flattened in the middle; radii about 

 twenty-five, broad on the disk, with very narrow interstices, and each rib with a crenulated 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. 



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