Shell thin, with a deeply channeled suture, strongly reflected lip, and thick parietal callous deposit. (Dall.)
DISTRIBUTION. Arctic, West America.

Description: Periostracum relatively thick, light olive, adherent, shiny or with very fine rows of microscopic bristles; shoulder subangulate, whorls rounded below strongly tabulate shoulder, suture deeply impressed. Apical whorls de- pressed. Axial sculpture lacking; spiral sculpture of early teleconch with sharply incised striations, becoming obsolete in later whorls; mature sculpture of low, somewhat irregular, slanted ridges; siphonal canal lacking, aperture deeply notched at base of pillar; lip thickened and slightly flared; lip may be continuous posteriorly across anal sinus, with continuous, offset parietal shield.