The solid shell is whitish,.very closely and finely striped with purplish brown, the stripes subequal, protractive, more or less dislocated on the base, where the spiral ribs are articulated with white and dark. Outlines of the spire are convexly conic.The whorls are a little swollen below the suture, where a series of low tubercles is irregularly developed. There is a tuberculiferous angle midway between suture and periphery, the latter angular and more or less tuberculate. The space above the peripheral cord is not divided by a median cord. There are several low spiral cords above and three or four below the median angle on the upper surface of the last whorl. The slightly convex base has about seven spiral cords. Aperture white, strongly thickened within, smooth. Columella white, with three small teeth. The narrow, deep umbilicus has a white border. Height 12.8 mm., diam. 15.0 mm. Pacific Mexico. Isla Maria Madre, Tres Marias group (Lowe).