Sinistral shell, ovate, dully bluish-white and rufescent on the obtuse apex; five whorls divided by a deep suture, transversely sulcate, nodose-costate longitudinally, with regular suboblique costae; aperture long, somewhat turrate; columella nearly straight callus; inside rufescent. A remarkable shell, sinistral, thick and ponderous, its last whorl occupies a part of the rear, so that the very long aperture may show. The whorls are ornamented with broad furrows and high transverse ribs; on the last whorl are counted about 20 ribs. The obtuse nipple-like apex is smooth and brownish; the other whorls are nodose-plicate longitudinally; color of the shell dully bluish-whitish and rufescent, especially on these places where the covering has been destroyed. Some of the growth most strongly emphasized toward the aperture. (Translation.)
TYPE in Zoology Museum, Copenhagen. Type locality, Sitka, Alaska.
RANGE. Pribilof Islands to Aleutian and eastward to Kodiak, Alaska.