72 POST-PLEIOCENE FOSSILS. 



BUCCINUM TRIVITTATUM. — Adams. 

 Plate XII. Fig. 2. 



Nassa trivittata, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 231. 



Nassa trivittata, Say, Conch. U. S., ed. Binney, p. 77. 



Nassa trivittata, Ravenel, Cat. Coll. Shells, p. 17. 



Buccinum trivittatum, Adams, Boston Jour. Nat. Hist., Vol. 2, p. 265. 



Buccinum trivittatum, Gould, Invert, of Mass., p. 309. 



Buccinum trivittatum, De Kay, Zool. New- York, Art. Mollusca, p. 132, pi. viii, fig. 165. 



Nassa trivittata, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xx. 



Nassa trivittata, Stimpson, Shells of New-England, p. 45. 



Buccinum trivittata, Tuomey S^ Holmes, Pleiocene Foss. So. Ca., p. 135, pi. xxviii, fig. 4. 



Tritia trivittata, H. 6f A. Adams, Gen. Mollusca, p. 122. 



Description. Shell ovate-conic, cancellate ; the surface presenting a net-work of 

 decussating lines ; lip with two or three teeth or raised lines within; apex acute. 



This species, like B. vibex, when found on the north-eastern shores of the United States, 

 has usually a chalky aspect, and we have no doubt is from the fossil sub-marine beds 

 of the Post-Pleiocene ; in advancing southwards it is more abundant, and living specimens 

 can be had in quantity on the southern coast. — T. Sf H. 



It is not uncommon in the Pleiocene beds of South-Carolina, but abundant in 

 the Post-Pleiocene. 



Plate XII. Fig. 2, Natural size. 



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



BUCCINUM ACUTUM. — De Kay. 

 Plate XII. Fig. 3. 



Nassa acuta, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 234. 



Nassa acuta. Say, Amn. Conch, vi; pi. 5, fig. 3. 



Nassae acute, Say, Conch. U. S., ed. Binney, pp. 78, 216, pi. 57, fig. 3. 



Buccinum acutum, De Kay, Zool. New- York, Art. Mollusca, p. 434. 



Description. Shell conic-acute, whitish, cancellated so as to appear granulated ; 

 granules prominent, somewhat transverse, inequidistant, the transverse grooves being more 

 profound and dilated than the spiral ones, which are six in number ; spire longer than body- 



