Shell small to moderate sized, 15-30 mm., with a tall turreted spire but a truncated body-whorl, with a very short shallowly notched anterior canal. It resembles a clavinid in general facies but the sinus is peripheral and there is no entering parietal callus pad. Protoconch small of two smooth turbinate whorls. Sinus moderately deep, narrowly rounded U-shaped, on the peripheral carina. Adult sculpture of strong axials crossed by equally strong to stronger spiral cords and there is a more or less well developed subsutural fold. The peripheral carina bears rounded to compressed nodules and the subsutural fold is usually distinctly crenulated. The outer lip is thin, without a varix, and the interior of the aperture is usually spirally fluted. Operculum leaf-shaped with a terminal nucleus. Radula, marginals only, of modified wishbone-type, the main member broadly conical, with the distal limb severed in nodulosa, and a long slender sinuous overlaid plate in hedleyi. Coloration plain buff to light brown, or weakly tessellated to blotched in darker brown.

The genus Epideira Hedley, 1918 was intended by its author to cover this genus of shells but Hedley's selection of Clavatula striata Gray, 1827 as type, upon the erroneous assumption that it was the common Sydney shell, makes Epideira available only for an at present unrecognisable species, probably from Western Australia, and Iredale's Epidirona must be used for Hedley's assemblage of species.

Range — Recent; New South Wales, Tasmania, southern Australia and Persian Gulf to China Seas. Tertiary; South Australia and Victoria, Miocene to lower mid Pliocene.