78 POST-PLEIOCENE FOSSILS. 



P O RC E L L A N A. — Adams. (1757.) 

 MARGINELLA.— Lam. (1801.) 



PORCELLANA LIMATULA. — Con. 

 Plate XII. Fig. 12. 



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



Marginella limatula, d'Orbigny, Prodrome de Paleontologie, Vol. 3, p. 51. 



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



Porcellana limatula. Tuomey $ Holmes, Pleiocene Foss. So. Ca., p. 130, pi. xxvii, figs. 10, 11. 



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. — T. 6? H. 



This is a common shell in the Post-Pleiocene beds of South-Carolina ; it differs from 

 the Pleiocene forms in having a more elevated spire ; the columellar has sometimes but 

 three plaits, though four is not uncommon. 



Plate XII. Fig. 12, Natural size. 



Locality. Simmons'; John's Island. 



Museum, College of Charleston; Cabinet F. S. H. 



VOLVARIA.— Lam. 



VOLVARIA CANALICULATA. -Say. 



Plate XII. Figs. 11, 11a. 



Volvaria canaliculata, Say, Jour. Acad. Nat. Sci., Vol. 5, p. 211. 



Volvaria canaliculata, Say, Conch. U. S., ed. Binney, p. 121. 



Bullina canaliculata, Say, Amn. Conch., pi. 39. 



Bullina canaliculata, Say, Conch. U. S., ed. Binney, p. 193. 



Volvaria canaliculata, Ravenel, Cat. Coll. Shells, p. 18. 



Bulla canaliculata, Gould, Invert. Mass., p. 166, fig. 97. 



Bulla obstricta, Gould, Invert. Mass., p. 167, fig. 96. 



Bulla canaliculata, De Kay, Zool. New- York, Art. Mollusca, p. 19, pi. xxv, fig. 328. 



