Shell short, stout, yellowish white to dark red brown in color, with nine to eleven whorls ; sculpture precisely resembling that of T. bigemma Watson, from which the shell differs in its shorter, stouter, and more abruptly tapered form ; in having about half the number of whorls; in the rounded and sculptured base, upon which are several spiral threads and numerous strong and elevated radiating lines of growth ; the anterior canal is very short and not closed in the specimens examined, the posterior canal indicated by a deep wide notch ; the outer lip patulous and flaring. Lon. of shell, 7.5 ; of last whorl, 2.5 ; of aperture, 1.5. Max. lat. of shell, 2.25; of aperture, 1.25 mm.
It would seem hardly probable that such an extreme disparity of form and number of whorls, as well as size, should exist in one species; however, since the variability of many of these deep-sea forms in many cases surpasses almost anything recorded from shallow water, I have hesitated to separate this little shell absolutely from Watson's species.

Cuba, Cape San Antonio, 640 fms. Yucatan Straits, 640 fms.