258 AMERICAN JOURNAL 



Z. BRiANii, Conrad. — PI. 21, fig. 9. 



Description. — Conical-depressed ; with smooth convex whorls ; 

 periphery acutely rounded ; base flat ; umbilicus small, nearly 

 filled with a deposit on the reflexed lip ; base with very minute 

 revolving lines. 



Locality. — Charles Co., Md. 



I am indebted to Prof. Cope for this species, who obtained it 

 and suggested that it be named in compliment to Oliver N. 

 Brian. 



TURRITILLID^. 

 TURRITELLA, Lamarck. 

 T, BiPERTiTA, Conrad. — PI. 21, fig. 1. 

 Proceed. Acad. Nat. Sci., vol. i, p. 326. 

 Locality. — Petersburg, Va. 



T. INDENTA, Conrad. — PI. 21, fig. 13. 



Description. — Broad at base ; whorls each with two revolving 

 obtuse lines, the inferior one largest, subtuberculated and mar- 

 gins the suture, and an impressed line marks its upper margin : 

 the other revolves on the upper margin of the whorls ; suture 

 profoundly excavated, sides of volutions slightly concave ; re- 

 volving lines rugose, minute. 



T. indenta, Conrad. — Journ. Acad. Nat. Science, vol. viii., 

 p. 188. 

 i;om%.— Calvert Cliifs, Md. 



Professor Cope obtained numerous specimens of this hitherto 

 rare species, one of which is represented in the figure. There 

 are three species with this remarkable excavation of the suture. 

 Turritella secta, Conrad, is the third, a small species from the 

 Eocene of Maryland, but the most deeply impressed of the 

 group. 



NATICID^. 

 LUNATIA, Gray. 

 L. CATENOIDES ? PI. 23, fig. 5. 



Natica catenoides, Wood. 



This is probably the young of iV. catenoides, a very abundant 

 species in the bank of St. Mary's River, Md. 



