Testa fusiformis, crassiuscula, glabra, extus intusque nigrofusca; spira leviter elata, acuta; anfractus 9, leviter convexi, costis 8 crassis rotundatis glabratis instructi; anfractus ultimus spiram paulo superans, convexus, obtusissime angulatus, leviter obliquus, haud rostratus, ad basim liris spiralibus 6-7, angustis munitus; apertura oblonga, columella rectiuscula, callo tenui induta; labrum acutum, sinu postico lato et profundo, antico lato sed minime profundo ; canalis brevissimus, latiusculus. Long. 15 mm, maj. diam. 6 mm.

This shell is of a glossy dark-brown colour throughout. The angularity common to the section Clavus is scarcely apparent, and the species may be said to approach the confines of the section Crassispira. D. cantharus, Reeve, from the same locality, is very similar in character, but of a much shorter and stouter form.