32 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Anachis sumterensis new species. Plate II, figs. 2, 6. 



General Characters. — Shell small, slender, fusiform, including 

 from 6 to 7 volutions. Whorls of spire keeled and slightly over- 

 hanging. Body whorl gently and evenly rounded, approximately 

 half as high as the entire shell. Posterior margins closely ap- 

 pressed. Suture distinct. 



Protoconch. — Nucleus small, erect, sub-globular, including 1^ 

 volutions. First turn and part of second smooth. Last quarter 

 turn sculptured with very fine, microscopic, axial striations. 



Sculpture.— Axisd sculpture of about 10 longitudinal undulations 

 which are most conspicuous upon the keel, evanescing above and 

 below and becoming almost or altogether obsolete upon the ultima; 

 growth lines confined to the interspaces between the spirals. Spiral 

 sculpture abruptly initiated at the origin of the conch; lirations 

 flattened, rather broad, conspicuous alike on the costal and the 

 intercostal areas, 4 in number on the early whorls of the spire, the 

 anterior the most prominent, so strong indeed, that it forms a 

 keel which overhangs the succeeding turn; one or 2 additional 

 spirals introduced on the later volutions betw^een the keel and the 

 anterior suture; lirations on the body 6 or 7 in number, similar 

 in character to those upon the spire; interspaces approximately 

 the width of the spirals, straight-sided and misroscopically striated 

 with fine, close-set incrementals; pillar and canal adorned with 

 about double the number of lirae present upon the body whorl, 

 these lirse differing, however, from the body spirals in being nar- 

 rower, slightly rounded and much more crowded. 



Aperture. — Aperture a rounded, irregular oval, angulated pos- 

 teriorly. Outer lip strongly arcuate, faintly Urate within. Inner 

 lip excavated, thinly calloused. Canal rather short for the genus, 

 wide and open, truncate anteriorly. 



Dimensions. — Altitude, 5.5 mm. Maximum diameter, 2.0 mm. 



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

 ville, Sumter County, South Carolina. Duplin Formation. 



Observations. — The overhanging whorls suggest the young of 

 Anachis styliola Dall, but the former is much more angular in 

 outline and is sculptured with numerous narrow riblets and ill- 

 defined spirals while in the latter, the axial costals are relatively 

 few in number and broad and undulatory in character, while 

 the spirals are strong and regular. 



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

 southeast of Mayesville, Sumter County, South Carolina. 



