Shell somewhat biconic, with about seven whorls, there being a single row of strong, somewhat longitudinal nodules on the center of the whorls; above the nodules the shoulder is slightly concave; the surface is sculptured with faint, longitudinal riblets crossed by almost obsolete microscopic striae; aperture rather short, slightly drawn out below; columella with three plaits. General surface purplish black or very deep brown; the large nodules on center of whorls are white. Length, 7 mm; diameter, 3 mm.