Shell large, slender, spindle-shaped, moderately thick. Color livid purple, more or less obscured by an ashy-white outer layer, more conspicuous near the sutures and on the callosity of the inner lip. Exterior, smooth (but not polished) except for the strong lines of increase. Sutures appressed; siphonal fasciole strong; nucleus small, white mammillated. Aperture more than half as long as the shell, white and livid purple, with a dash of brighter purple at the posterior notch and on the anterior portion of the callus. Edge white, callus reflected, thick and strong, with a chink behind the anterior portion. Canal twisted to the right, moderately deep. Long., 4.13; lat., 1.62; long, apert, 2.59 in. (Dall.)

Type locality, Pribilof Islands, Alaska.
RANGE. Pribilof, Aleutian, and Shumagin Islands, Alaska.