AS E. slevini
Shell small, pure white; nuclear whorls 4, elevated, noticeably smaller than the first postnuclear whorl, smooth; postnuclear whorls 6, well rounded, separated by a deep suture, regularly increasing in size, forming a slender turreted spire; axial sculpture of 14 thin, strongly reflected varices, without angle or spine where they curve into the suture in which they meet and fuse, ascending the spire in a continuous line approximately parallel with the right side of the shell; on the base the varices continue without change to the base of the columellar lip; spiral sculpture of strongly incised spiral lines of which about 12 appear on the spire and 18 on the last whorl; aperture nearly entirely broken away in the type. The type measures: length, 4.3 mm; diameter, 2.0 mm.
Holotype: No. 724 (Calif. Acad. Sci. Paleo. Type Coll.), from Loc. 27,228 (C.A.S.), dredged in from 3 to 9 fms. off Taboga Island, Panama. It is probably not fully adult. L. G. Hertlein collector. Three additional but younger specimens were dredged at the same locality.
No other species with similar spiral sculpture and approximately this number of unarmed varices seems to have been described from the west coast of the Americas.
This species is named for Mr. Joseph R. Slevin, Curator of Herpetology of the California Academy of Sciences, who has collected numerous specimens for the Department of Paleontology of the same institution.