OF CONCHOLOGY. 65 



ILLUSTRATIONS OP MIOCENE FOSSILS, WITH 

 DESCRIPTIONS OF NEW SPECIES. 



BY T. A. CONRAD. 



NASSLD^E. 



NASSA, Lam. 



Subgenus, BULLIOPSTS, Conrad. 



This subgenus is distinguished by the absence of conspicu- 

 ous striae or ribs, while the species are variable in form, and 

 the labrum is without lines within. 



N. quadrata, Conrad. — PL 3, fig. 1. 



Description. — Ovately turrited ; whorls scalariform, with an 

 obtuse revolving ridge on the angle; body whorl slightly con- 

 tracted below the ridge ; columella callous, with the deposit 

 broad. 



N. quadrata, Conrad. — Journ. Acad. Nat. Sci., Vol. VI., p. 

 226, pi. 9, fig. 16. 



This is a variable, but distinct species ; on the body whorl 

 are indistinct revolving lines near the base, and occasionally 

 irregular obsolete lines on the ridge. 



Locality. — St. Mary's Co., Md. 



N. Marylandica, Conrad. — PL 3, fig. 3. 



Description. — Oblong-ovate, entire ; whorls 6. slightly con- 

 vex; body whorl slightly flattened laterally; suture impressed; 

 spire conical; columella callous, broad and thick on the sum- 

 mit; aperture about half the length of the shell. 



Bullia Marylandica, Conrad. — Proceed. Acad. Nat. Sci., 

 1862, p. 287. 



Locality. — St. Mary's Co., Md. 



