Shell, elongated, slender, acute, yellowish white, of about twenty-three whorls; nucleus missing in the specimens at hand ; spiral sculpture consisting of two principal rows of rounded tubercles, with spirally confluent bases, which are conspicuous from the beginning to the end of the spire ; if there is any difference in size, the anterior row is slightly the larger ; there are about eighteen of these tubercles on the last turn; the posterior row lies close to and somewhat appressed upon the suture ; midway between these is a smaller spiral riblet, which rises into narrow elongated waves, or tuberculations, in harmony with the others ; at the base of the whorl is a simple riblet very slightly or not at all waved, and nowhere rising into tubercles ; these spiral series are about equidistant, but the space between the anterior row of tubercles and the basal riblet is more deeply excavated than the others ; base somewhat flattened, conical, with an outer strong spiral ridge and two or three inner fainter ones; the transverse sculpture consists solely of the lines of growth, which are conspicuous only on the base ; the tubercles, however, are arranged so as to appear as if placed obliquely from right to left across the whorls, so that on the length of the spire the transverse row makes nearly one revolution around the shell ; suture inconspicuous ; pillar short, stout, strongly recurved, with a thick and projecting callus ; anterior and posterior canals open in the specimens examined; outer lip produced anteriorly, very oblique, forming a narrow aperture; adult shell with the outline of the spire slightly convex. This shell somewhat resembles T. concors Hinds, from the Straits of Malacca, but the aperture in our species is much narrower, and the shell is of a different color. The base is also of a somewhat different shape. The specimen measured is the most perfect, but not the largest. Lon. of shell, 11.0; of last whorl, 2.25; of aperture, 1.5. Max. lat. of shell, 1.75 mm.