130 PLEIOCENE FOSSILS. 



margin of the channel carinated; spire elevated, prominent; lines on the superior whorls 

 raised, acute, sub-carinated ; on the body-whorl obscure, except on the base which is sul- 

 cated and strongly striated ; the columellar lip has seven oblique plaits, the upper one 

 profound, the two lowest are almost obsolete, and of the same size. 



Plate XXVII. Fig. 9, Natural size. 



Locality. Pee Dee, Museum, College of Charleston. 



PORCELLANA. — Adans. (175 7.) 



MARGINELLA.— Lam. (1801.) 



PORCELLANA LIMATULA.-Coh. 



Plate XXVII. Pigs. 10 and 11. 



Marginella limatula, Con., Jour. Acad. Nat. Sci., Vol. 7, p. 140. 

 Porcellana limatula, Con., Proc. Acad. Nat. Sci., Vol. 7, p. 31. 



P. testa ovata, polita; spira brevissima; labro interne denticulato; margine medio tumido; 

 apertura superne contracta; columella quatuor obliquis elevatis plicis. 



Description. Shell ovate, polished; spire very short; labrum denticulated on the 

 inner margin ; margin swelling in the centre, aperture contracted above ; columellar with 

 four oblique elevated plaits. 



There is a common shell in the Post Pleiocene beds of South-Carolina, which we are 

 disposed to consider a variety of this species; it differs in having a more elevated spire, 

 and the columellar has but three plaits. 



Plate XXVII. Figs. 10 and 11. Natural size. 



Locality. Pee Dee. Museum, College of Charleston. 



