Shell fusiform very slender, reddish, cancellate with about 13 costae, aperture equal to half the length, more slender than the former (species) ; whorls 6-7 convex, slightly tumid, in the rear angulate, flattened, prolonged in zones, very slender behind the angle, stronger in the middle of the whorl, with more slender lines intercalated here and there; costae strong, elevated, subsigmoidal behind, subnodose on the angle, disappearing on the tail; suture deep; aperture narrow, columellar margin in the rear scarcely sinuate; basal canal, subcompressed. Outer lip white, acute, in the rear sinuate to the angle; throat obscurely dusky. Differs from T. harpularia in the more slender form, in the more tumid whorls, deeper suture, and much stronger costae. (Translation.)

North Atlantic / Arctic. Also North Pacific: Simeonoff Island, Shumagins, to San Juan Islands, Washington.