22 PROCEEDINGS OF THE ACADEMY OF [Feb., 



4 strong lirae, the third from the posterior suture being the strong- 

 est. Dividing Hne between conch and protoconch very sharp, 

 marked by the abrupt reduction of the spiral sculpture and the 

 even more abrupt appearance of the axial sculpture. 



Sculpture. — Axiah low and rounded, 13 or 14 to a turn, least 

 prominent upon the body, obsolete upon the pillar; interaxial 

 areas broadly concave, usually wider than the axials. Spirals 

 somewhat irregular, wide, flattened, little elevated bands, separ- 

 ated by narrower interspaces, 4 or 5 in number on the earlier 

 whorls, 10 or 12 on the ultima and pillar. Posterior fasciole dis- 

 tinct, sculptured with 3 low, flat spirals separated by linear inter- 

 spaces, and with a prominent rounded thread revolving anterior 

 to the suture; a much less prominent liration also developed just 

 posterior to the suture. 



Aperture. — Aperture narrow, obliquely lenticular, acutely angu- 

 lated at the posterior commissure. Labrum broadly and feebly 

 arcuate. Siphonal notch narrow and not very deep. Labium 

 feebly convex. Pillar straight, simple. Parietal wall and pillar 

 heavily reinforced. Anterior canal short, rather broad, feebly 

 emarginate. 



Dimensions. — Altitude, 7.2 mm. Maximum diameter, 3.0 mm. 



Type Locality. — Muldrow's Place, 5 miles southeast of Mayes- 

 ville, Sumter County, South Carolina. Duplin Formation. 



Observations. — It seems quite probable that this late Miocene 

 Drillia is the ancestor of the Caloosahatchie Pliocene form, Drillia 

 piscator Dall. In general aspect, it is a more highly polished 

 shell with a less strongly defined sculpture. In detail, it differs 

 from D. piscator in the nuclear characters, the more numerous 

 axial ribs, which are more prominent especially on the ultima, 

 the narrower and more elevated spicals and the stronger and more 

 angular liration revolving anterior to the suture. 



Distrihuiion. — Duplin Formation. Muldrow's Place, 5 miles 

 southeast of Mayesville, Sumter County, South Carolina. 



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

 versity. Academy of Natural Sciences of Philadelphia. 



Drillia sumterensis new species. Plate I, flg, 3. 



General Characters. — Shell rather small for the genus, slender, 

 tapering. Component volutions 10 in number. Whorls of spire 

 gently convex, regularly increasing in diameter. Body less than 

 half as high as the entire shell, rounded like the later whorls of 



