1919.] NATURAL SCIENCES OF PHILADELPHIA. 29 



We have the pleasure of naming this interesting species in honor 

 of Dr. Earle Sloan, of Charleston, South Carolina, whose name 

 will always be so pleasantly associated with the development of 

 the Geological Survey of South Carolina. 



Distribution. — 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. 



Alectrion neogenensis new species. Plate I, figs. 5, 6. 



General Characters. — Shell elevated, slender, turrited. Body 

 whorl slightly more than half the altitude. Conchal whorls 6 

 in number, feebly convex, the ultima abruptly constricted at the 

 base. Suture line distinct, slightly impressed, undulated by the 

 costals of the preceding volution. 



Protoconch. — Protoconch of 2 small, smooth, button-like whorls, 

 the earlier turn submerged in the later. 



Scidpture.— Axial and spiral sculptm-e normally initiated simul- 

 taneously; in some individuals, however, the costals apparently 

 preceding the spirals. Costals, when well established, narrow, 

 rounded, and moderately elevated, 10 to 14 in number on the 

 later volutions; for the most part, equi-size, persistent with uni- 

 form strength from suture to suture and separated by intercostals 

 of approximately equal width. Spirals regular as a rule, in size 

 and spacing, from the nucleus to the anterior canal, very low, 

 rather broad, overriding the costal and the intercostal areas with 

 uniform strength, 6 in number on the later whorls of the spire, 

 and 10 or 12 on the body,^ — the two anterior narrow, and more 

 elevated than those behind; interspirals equal to or a little nar- 

 rower than the spirals. Base of body margined by profound 

 sulcus on which the incremental sculpture is well marked. Anterior 

 fascicle bearing some half dozen crowded spirals. 



Aperture.- — Aperture not quite one-third the total altitude, 

 obliquely ovate. Outer lip sub-varicose, flaring anteriorly, though 

 abruptly contracted at the canal; inner denticles sharp little ridges 

 at right angles to the margin, uniformly spaced and about 6 in 

 number. Columellar lip sigmoidal, heavily calloused, the outer 

 margin of the callous sharply defined. A rather prominent trans- 

 verse ridge developed near the posterior commissure, and shorter 

 irregular denticles toward the anterior canal. Anterior canal 

 short, recurved, and deeply emarginate. 



