The sculpture is delicate and consists of spiral keels or threads and often oblique riblets on the shoulder of the whorls.

This group is intended to contain the operculated species of Pleurotomida which are so characteristic of the archibenthal region.

They are distinctly contrasted with the coarse, spotted or maculated shallow-water species of Pleuroma proper, by their thin, white, delicately sculptured shells.

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.