Shell fusiform, turreted, color an uniform dark brown; whorls, six, convex, having numerous slightly elevated, revolving ribs, with intervening striae upon the lowest, and impressed in their middle portion by a deep sulcus, which forms a distinct revolving carination upon each side of it; sutures clearly defined; body-whorl half the entire length of the shell; striae of growth, minute; outer lip thin, subarcuated, serrated on its margin by the terminating striae; the sinus at its juncture angular, very slight, and hardly amounting to a fissure; columella arcuated at its superior third; aperture elliptical, terminated by a short canal slightly inclining to the left. Long., 11/40; diameter of last whorl, 2/40 in. (Couthouy.)

Type locality, east of Nahant, from the stomach of a haddock.
RANGE. Point Belcher, Arctic Ocean, to Puget Sound. Circumboreal.