yjot from hnterprioe-, but ^roiii 

 the J^i^Vson formation *it Garl^in^ ; 

 ^reek, =5 miles east of Ghubuta. 

 (See .'J.rdioh, A. J. S., v, =50, 



p. J.07, r"''5. 



DESCRIPTIONS OP NEW EOCENE SHELLS PHOM 

 ENTERPBISE, MISSISSIPPI. 



BY T. A. COXEAD. 



Dr. "William Spillman, who formerly resided in Columbus, 

 Miss., has forwarded to the Academy of Natural Sciences of 

 Philadelphia, many new Cretaceous and Eocene fossils, among 

 which I find a series collected at Enterprise, Clarke Co., Miss., 

 all of which are new, and distinct from those of any other 

 locality from which fossils have been sent to the Academy. 

 The group, I presume, is more nearly synchronous with that of 

 Claiborne than with the Jackson group. 



CORBULA, Lam. 



C. FiLOSA, nob. — pi. 10, fig. 7. 



Description. — Subtriangular, subequilateral ; umbonal slope 

 carinated and submarginal; surface striated with fine imbri- 

 cated lines. 



One valve only is in the collection, (the larger valve,) and 

 is very distinct from the other American Eocene species. 



DIONE, Gray. 



D. SECURIFORMIS, nob. — pi. 10, fig. 1. 



Descrijjtion. — Subcordate, ventricose, with concentric re- 

 curved ribs; anterior margin acutely rounded; posterior ex- 

 tremity subtruncated ; lunule cordate, defined by a slightly 

 impressed line; right valve — cardinal teeth approximate, 

 curved, direct. 



D. AXXEXA, nob. — pi. 10, fig. 5. 



Description. — Ovate, convex ; posteriorly cuneate, abruptly 

 rounded at the extremity; substance thick; anterior side 

 short, obtusely rounded ; ventral margin rounded ; umbo 

 broad ; anterior cardinal tooth robust in the left valve, py- 

 ramidal. 



One valve only is in the collection, and is water-worn, but 

 otherwise entire. It differs from D.perovata in being a smaller 

 species, less in diameter through the umbones, and less pro- 

 duced posteriorly. It has some resemblance to D. silicea, C, but 

 is shorter anteriorly, and proportionally longer in outline. 



