Shell having the aperture subquadrate, rather longer than wide ; outer lip arched obliquely backwards above a deep sinus, then produced prominently below the sinus, and curved round to meet the columella, where it is slightly canaliculated.
Distinguished from the type and other sections of Turritella by the deep sinus in the outer lip, by the lower part of the lip being more produced forwards, by the columella being longer and nearly straight, and by the aperture being slightly channelled below.