1919.] NATURAL SCIENCES OF PHILADELPHIA. 41 



a little less arcuate. The greater dimensions will serve to 

 separate C. flemingi from the only other unsculptured species 

 of the Neocene of Virginia and North Carolina, the Caecum glahrum 

 of Montagu. 



The species is named in honor of the author of the genus. 



Distribution. — Duplin Formatio7i. Muldrow's Place, 5 miles 

 southeast of Mayesville, Sumter County, South Carolina. Wac- 

 camaw Formation. Neill's Eddy Landing, 3 miles north of Cron- 

 ley, Columbus County, North Carolina. 



Collections. — U. S. National Museum. Johns Hopkins Uni- 

 versity. Academy of Natural Sciences of Philadelphia. 

 Turritella duplinensis new species. Plate II. fig. 4. 



General Characters. — Shell a uniformly tapering pyramid, rela- 

 tively more slender in the immature stages than in the adult. 

 Volutions approximately 15 in number. Earlier coils prominently 

 keeled at the periphery, the later trapezoidal, or slightly over- 

 hanging. Peripheral angle approaching a right angle. Base flat- 

 tened to slightly convex in the adult. Suture lines distinct, the 

 later whorls somewhat constricted. 



Protoconch. — Protoconch small, smooth, twice-coiled, with 

 slightly tilted tip. 



Sculpture. — Axial sculpture absent or restricted to faint, irregu- 

 lar, incremental wrinkles on the later whorls of the adult. Spiral 

 sculpture fairly constant for the genus; in a typical, half-grown 

 individual, a single, well rounded primary, situated posterior 

 to the suture line and strong enough to subcarinate the later whorls; 

 secondaries 2 in number, as a rule, the one outlining the equatorial 

 region of the whorl, the other a little behind it, the latter increasing 

 in prominence away from the apex, the former crowning the periph- 

 ery of the earlier whorls, decreasing in relative elevation anteriorly; 

 a tertiary intercalated about midway between the suture and the 

 posterior secondary, and another directly in front of the primary 

 and constituting the circumbasal lira of the ultima; quaternaries 

 sub-equal, and separated by equal interspaces, 12 to 15 in num- 

 ber, 3 between the posterior tertiary and the suture, 1 to 3 between 

 the posterior tertiary and the posterior secondary, 3 or 4 between 

 the two secondaries, 5 between the anterior secondary and the 

 primary, 1 to 3 between the primary and the anterior tertiary 

 and occasionally 1 or 2 between the anterior tertiary and the 

 suture; basal lirae 15 to 20, the majority of them fine, but with 

 coarser threads irregularly interspersed. 



