 They are apart from "Drillia" by having no subtubular projection of the anal notch when adult and no thick varix to mark their maturity.They are separable from the archibenthal Drillias also by their larger shells, longer siphonal canal, and more inflated habit.The anal notch is generally wider, more rounded and nearer the suture than in the typical "Pleurotoma", and the operculum proportionally wider and more delicate.