96 POST-PLEIOCENE FOSSILS. 



Crepidula aculeata, L. R. Gibbes, Tuomey's Geol. So, Ca., appendix, p. xx. 

 Crepipatella aculeata, H. $ A. Adams, Gen. Mollusca, Vol. 1, p. 369. 



Description. Shell oval, convex, longitudinally ribbed, ribs thick, elevated wrinkled, 

 with a series of erect spines ; diaphragm sinuous, with a ridge in the middle extending 

 from the beak to the margin ; apex of shell lateral, incurved, sub-terminal. 



The lateral, incurved, sub-terminal beaks, are characteristic of this genus. 



Plate XIV. Fig. 12, Natural size. 



Locality. John's Island, Stono River. 



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



CHITON.— Linn. 



CHITON APICULATUS. — Say. 

 Plate XIV. Pigs. 13, 13a, 13b, 13c. 



Chiton apiculatus, Say, Amn. Conch., 8. 



Chiton apiculatus, Say, Conch. U. S., ed. Binney, p. 231. 



Chiton apiculatus, Ravenel, Cat. Coll. Shells, p. 8. 



Chiton apiculatus, Gould, Invert. Mass., p. 146, fig. 20. 



Chiton apiculatus, De Kay, Zool. New York, Art. Mollusca, p. 164, pi. x, figs 201, 202. 



Chiton apiculatus, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xx. 



Chiton apiculatus, Stimpson, Shells of New-England, p. 28. 



Description. " Valves eight ; dorsal triangles, with series of elevated points ; lateral 

 triangles with scattered elevated points. Inhabits the coast of South-Carolina." — Say. 

 Only a single dorsal valve of this shell has as yet been found in the Post-Pleiocene. 



Plate XIV. Fig. 13, Side view, natural size. 



" 13a, View from above. 



" 13Z>, Magnified view of same. 



" 13c, Magnified view of one series elevated points 



Locality. Simmons'. Museum, College of Charleston; Cabinet F. S. H 



