Shell slender, acute, blackish brown with the anterior part of the last whorl pale reddish brown, a conspicuous periostracum, a closely appressed suture separated by a single cord from the constricted anal fasciole; whorls nine, without the (lost) nucleus; axial sculpture of (on the last whorl eight) prominent angular ribs with wider interspaces, beginning abruptly at the shoulder rapidly dwindling anteriorly and obsolete on the base; these ribs are crossed by (on the last whorl about 14) widely spaced slender cords, slightly nodulous at the intersections; aperture narrow, anal sulcus shallow, outer lip sharp, simple, a slight subsutural callus, the inner lip erased, the pillar straight, the canal wide and very slightly recurved. Height of shell, 38; of last whorl, 22; diameter, 11 mm. Cat. No. 96664, U.S.N.M.
Range.—Off Lower California in 21 fathoms sand. U. S. Bureau of Fisheries steamer Albatross.
This species belongs to the group of T. olivacea and duplicate Sowerby. though much more slender and differently sculptured.