Station 95 (Cape Agulhas), station 105 (35°29’S, 21°2.5’E, 102 m depth) and station 106 (35°26.8’S, 20°56.2’E, Agulhas Bank), some of the mostly juvenile shells have some resemblance with the West Indian species T. triserialis Dall, which has a more pointed top. The white shells are very slender with slightly rounded whorls which increase little in size; the first and second embryonal whorls are slightly rounded and sculptured with two spiral keels, while all the following whorls show three spiral cords with tubercles; on the suture, another finer smooth cord is visible. The sutural cord forms on the last whorl a strong edge and underneath this edge another spiral cord is visible. The siphonal canal is straight, moderately long and the aperture is sub-quadrangular (the aperture is damaged on the figured shell). Height 7 mm, diameter 1.6 mm.

Diagnosis
Lectotype height 7.0 mm. Shell very slender, conical, with almost flat whorls. Teleoconch of nine whorls, which have three tubercled spiral cords, well developed since the first teleoconch whorl. A very fine suprasutural smooth cord is also present, but barely visible in most apical whorls. Paucispiral large apex of four whorls; the first whorl bears two strong smooth spiral cords, while the others bear three tubercled cords. Colour white. Base and peristome cannot be properly described on the basis of the studied type material.