84 CONCHOLOGIA CESTRICA. 



G. Virginica, GMELIN. 



Buccinum Virginicum, Gmelin, Syst. Nat., 

 I., 1788. 



Shell, rather thin, smooth, elongated ; 

 whorls 6, or 7, slightly convex, upper ones 

 carinate ; aperture oblong-elliptical ; color 

 brown, or olivaceous, usually with two re- 

 volving, reddish bands ; within bluish- 

 white. H. 25-32, W. 10, mill. 

 Station, Schuylkill River, Chester County; abundant. 



G. Virginica, var. multilineata, SAY, Jour. Acad. 

 Phila., II., 1822. 



Shell, resembling the preceding, but with numerous, 

 filiform, elevated, sub-equal, lines ; from ten to twenty 

 on the body whorl. 



Station, found with the preceding. 



Genus ANCULOSA, SAY, 1821. 



Shell, solid, ovate, or globose; spire very short; 



columella callous above ; peristome almost as large as 



the whole shell, not continuous; opercle corneous, 

 semi-concentric, or pauci-spiral. 



A. dissimilis, SAY. 



Paludina dissimilis, Say, Nich. Encyc., 3d Edit, 

 1819. 



A. (Ussimiiis. Shell, thin, ovate, conical ; whorls 3-4 ; 

 body whorl large, more or less carinate in 

 the middle, carina sometimes double, or 

 wanting ; aperture ovate ; columella flat- 

 tened at base, and occasionally toothed ; 



color olive-green, or yellow. H. 12, W. 8, mill. 



