Shell large and thin livid flesh color, with a dehiscent, thin, pale brownish periostracum; suture distinct, constricted, the whorl slightly flattened in front of it; spire attenuate with seven whorls exclusive of the (lost) nucleus, the apical whorls feebly irregularly axially plicate, the others with only rather conspicuous silky incremental lines; at the shoulder on the last whorl are developed low oblique irregular ridges with wider interspaces; a few also appear near the periphery; on the base there are about eight low obscure ridges with wider interspaces; aperture ovate, pinkish brown within, outer lip thin, body and pillar with a layer of enamel, the pillar nearly straight, as in the wide short canal; the operculum large, black, with apical nucleus. Height of shell, 144; of last whorl, 78; diameter, 58 mm. (Dall.)
TYPE in United States National Museum, No. 224077. Type locality, United States Bureau of Fisheries, Station 3549, in Bering Sea.
RANGE. Pribilof Islands to Unalaska, Alaska.