Shell, elongate-ovate, very narrowly umbilicated, turrited, yellowish-white. Nuclear whorls small, obliquely immersed in the first of the succeeding turns, above which only half of the last volution projects and extends beyond the outline of the spire. Post-nuclear whorl is broadly, tabulatedly shouldered at the summit, moderately rounded, marked by almost vertical lines of growth and numerous exceedingly fine spiral striations. Sutures rendered very conspicuous by the tabulated shoulder. Periphery of the last whorl well rounded, base moderately long, well rounded, marked like the spire. Aperture large, elongate-ovate, somewhat effuse anteriorly; posterior angle decidedly obtuse; outer lip thin; columella slender, oblique, and somewhat revolute, provided with an oblique fold a little anterior to its insertion; parietal wall glazed with a thin callus.
Specimens of this species were dredged in 18 to 28 fathoms at Ship channel, Barkley sound, Vancouver island, B.C., part of which are in the collection of the Geological Survey, Ottawa, and others in the United States National Museum, Catalogue No. 211530. The specimen figured has five post-nuclear whorls, and measures: length, 4.7 mm., diameter, 2.2 mm.
The strongly tabulated summit of the whorls separates this species from all the known Evaleas of the Oregonian faunal area.