Shell of small to medium size, up to 57.5 mm. (2,25 inches) in length, solid, rather narrowly ovate and depressed, the apex near to the anterior margin at all stages of growth. From 20 to 25 broadly rounded radial ribs, with an occasional weak interstitial one; surface smooth, apart from weak growth lines. Colour of exterior bluish-white, heavily blotched and streaked with light to dark-brown, the pattern frequently running together, leaving elongated patches of the pale ground colour; interior pale amber, with the external pattern showing through in dark brown; spatula dark-brown in young shells, to clouded with buff or pale-brown in adults. Length: 16,5 – 41 mm; Width: 10,5 – 45 mm; Height: 4-20 mm.

This species is easily recognised by its narrowly ovate and depressed shape, with the apex at, or near to, the anterior end, and a bold pattern of radial streaks and blotches.

Bounty Islands, southern New Zealand. Chatham Island.