Shell ovately fusiform, solid, opaque. Whorls including the nucleus 9 ; nucleus of two whorls, smooth, inflated. Spire-whorls convex, angled at their centre, behind this slightly excavated by a rather wide, conspicuous groove, behind this a prominent rounded subsutural band. Longitudinal plicae numerous, regular, 16 in the penultimate whorl, slightly coronated at the angle, and forming slightly elongated nodules on the subsutural band. Distinct engraved spiral lines, crossing the plicae, three or four in front of the angle, two or three in the groove, producing, if well marked, a row or two of small round granules there. Body-whorl with the subsutural nodulated band, anterior to this the excavated groove, followed by its angle of junction with a uniform, slightly convex surface. The longitudinal plicae may extend almost to the base, or may become obsolete at the periphery ; and generally become less marked towards the aperture in older shells. Spiral engraved lines 13 to 15, equidistant, most marked at the base, so as to form there about live obliquely rounded spiral lirae. Aperture obliquely elongate-ovate, contracted behind between the subsutural band and a small columel-lar callus, minutely canaliculate. Outer lip simple, thin, slightly sinuous, internally seven narrow spiral plicate teeth, equidistant, extending to within a line of the margin. Columella nearly straight, concave at the base, where the callus is thick and closes the umbilicus ; a rather broad spiral plica lies over the situation of the continuation backwards of the varix of the notch, it may be simple or bifid or three or four divided. Notch well marked, with minutely everted margins, varix of notch valid, and bounded above by a definite slightly elevated edge continuous with the sharp right margin of the notch. Ornament, rusty-brown or deep mahogany, with bluish white patches composed of several oblong spots disposed between the engraved lines, most numerous just above and below the angulation and towards the base. In these areas the brown and whitish spots may be almost regularly articulated, or so disposed as to form longitudinal brown flames. Living shells are often brightly glistening, dead shells uniform dull rusty brown.
Length, 25 mm.; breadth, 10 mm.; spire, 14 mm.; aperture, 10 mm. long, 4 5 broad.
Habitat.—Along the whole coast of South Australia, at low water. Eyre's Sandpatch, West Australia, large specimens.