80 POST-PLEIOCENE FOSSILS. 



NATICA.— Lam. 



NATICA DUPLICATA. — Say. 

 Plate XII. Fig. 14. 



Natica duplicata, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 247. 



Natica duplicata, Gould, Invert, Mass., p. 236, fig. 163. 



Natica duplicata, Ravenel, Cat. Coll. Shells, p. 12. 



Natica duplicata, De Kay, Zool. New York, Art. Mollusca, p. 121, pi. vii, fig. 147. 



Natica duplicata, L. R. Gibbes, Tuomey's Geol. So Ca., appendix, p. xx. 



Natica duplicata, Stinipson, Shells of New-England, p. 43. 



Natica duplicata, Tuomey ^- Holmes, Pleiocene Foss. So. Ca., p. 114, pi. xxv, fig. 16, 



Natica duplicata, Say, Conch. U. S., ed. Binney, p. 85. 



Lunatia duplicata, H. 4- A. Adams, Gen. Moll., Vol. 1, p. 207. 



Description. Shell solid, conical-ovate; umbilicus irregular, deeply grooved, and 

 partially or entirely covered with a callus; aperture ovate, oblique. 



This is an abundant species, but variable in shape ; in some specimens the spire is more 

 elevated than in others. In a recent state it is common along the Atlantic shores of the 

 United States, south of Nantucket. — T. $ H. 



Plate XII. Fig. 14, Natural size. 



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



NATICA PUS ILL A.— Say. 

 Plate XII. Figs. 15, 15a. 



Natica pusilla, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 257. 



Natica pusilla, Gould, Invert Mass., p. 237, fig. 166. 



Natica pusilla, De Kay, Zool. New- York, Art. Mollusca, p. 123, pi. vii, fig. 145. 



Natica pusilla, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xx. 



Natica pusilla, Stimpson, Shells of New-England, p. 43. 



Lunatia pusilla, H. 4- A. Adams, Gen. of Mollusca, Vol. 1, p. 207. 



Natica pusilla, Say, Conch. United States, ed. Binney, p. 87. 



Description. Shell small, about half inch in length, sub-oval, marked with longitudinal 



