PLEIOCENE FOSSILS. 105 



GASTEROPODA. 

 DENTALIADJ. 



DENTALIUM.— Lin. 



DENT A LI UM ATTENUATDM. — Say. 



Plate XXV. Fig. 1. 



Dentalium attenuatum, Say, Jour. Acad. Nat. Sci., Vol. 4, p. 154. 



D. testa leviter curvata, conica, costata; costis quindecim, prominulis teretibusque, ad 

 basim attenuatis; incrementi lineis multis, indistinctis; apertura rotunda. 



Description. Shell slightly curved, tapering, costate; costse 15, distinct and rounded, 

 less prominent towards the base, intervening grooves simple ; lines of growth numerous 

 but indistinct; aperture orbicular. 



Say described this species from a Meiocene fossil of Maryland. D. dentale, Conrad, 

 we infer is a Virginia fossil, though he does not give the locality. The South-Carolina 

 specimen agrees with Say's description. Dr. Gould makes D. attenuatum a synonym of 

 D. dentale, Linn, which is a recent shell from the coast of Massachusetts. 



Plate XXV. Fig. 1, Fossil, natural size. 



Locality. Pee Dee. Museum, College of Charleston. 



DENTALIUM PLEIOCENUM.— {New Specks.) 



Plate XXV. Fig. 2. 



D. testa modice incurvata, costis duodequadraginta, indistinctis obtecta; incrementi lineis 

 multis parum distinctis; apertura rotunda. 



28 



