PLEIOCEXE FOSSILS. Ill 



CEYPTA S P I N S A . 

 Plate XXV. Fig. 10. 



Crepidula spinosa, Con., Proceed. Acad. Nat. Sci., Vol. 1, p. 307. 



C. testa ovali, convexa, costata; costis cum irregularibus arcuatis spinis; septo subconcavo; 

 margine soluto sinuoso. 



Description. Shell oval, convex, costate; costse with irregular arched spines, formed 

 by the rugose lines of growth ; diaphragm sub-concave, occupying one half of interior of 

 shell, free edge sinuous. 



We refer this shell, with some doubt, to C. spinosa, Conrad, though it resembles C. 

 actjleata, a recent species of the coast, but much larger than any specimen we have 

 met with. 



Plate XXV. Fig. 10, Natural size. 



Locality. Pee Dee. Museum, College of Charleston. 



CEYPTA PLANA. 

 Plate XXV, Fig. 12. 



Crepidula plana, Say, Jour. Ac. Nat. Sci., Vol. 2, p. 226. 



Crepidula plana, Say, Amn. Conch., pi. 44. 



Crepidula plana, Gould, Invert. Mass., p. 159, fig. 16. 



Crepidula plana, d'Orbigny, Prodrome de Paleontologie, Vol. 3, p. 177, No. 248. 



C. testa oblongo-ovali, superficie. plana aut convexa; longitudinalibus rugis; apice non- 

 prominente angulari; septo convexo. 



Description. Shell oblong-oval, surface flat or convex, wrinkled longitudinally; apex 

 not prominent, but angular, sometimes obsolete; diaphragm convex. 



