Shell with angulate whorls, concave above periphery, sutures indistinct. Spire whorls with a strong spiral rib about one third of whorl width from lower suture. Body whorl with 4-7 strong spiral ribs and about eight low broad axial folds, the whole surface covered with dense axial lamellae overriding the ribs. Anterior fasciole strong. Columella smooth, outer lip of mature shells thickened internally and with 4-5 denticles. Exterior fawn or grey with white spiral ribs; aperture purple-brown, columella cream.
Size: Up to 22 mm in length, typically 10-15 mm.
Distribution: Endemic to Australia; Gerringong, NSW, to Cockburn Sound, WA, including Tas.
Habitat: "On and under rocks in mid to high-tide areas, particularly among Galeolaria and on beds of the small mussel Xenostrobus pulex on which it feeds" (Phillips et al, 1984).
Remarks: Some southern Australian shells differ in sculpture from the NSW specimens described above; they may be rounded rather than angulate, with axial folds absent, and with up to 12 weak spiral ribs. [NSW]

Oval, thick, scaly, spire elevated; whitish, usually covered by a green coating; axial ribs, rugose, lamellose, crossed, so as to form a sort of rough coarse network, by about eight rather projecting spiral ribs; adult whorls five, slightly convex, and the absence of spiral ribs just below the suture, makes them appear keeled; body-whorl rather longer than the spire; mouth narrowly oval, deep wine-colour; outer lip stoutly thickened, about five whitish tubercles inside at some distance from the edge; inner lip tinged whitish inside; operculum reddish-brown, nucleus sublateral. Height 26, diam. 14 mm. All round the coast of South Australia, on rocks! at low-water. Rather common. Also Western Australia, Albany; does not appear to occur beyond C. Leeuwin. (Type locality—the seas of New Holland [Peron]). Very variable and has an extensive synonymy. Exceptional specimens have the axials coalesced, with as few as four very wide and high with second axials on them; others with very narrow axials up to fourteen, while in others they are nearly obsolete; so the spiral cords in some are very valid and nearly equal, in others they are obsolete or unequal.