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Sinum incisum (Reeve, 1864) Description: Shell flattened, with very low spire and wide aperture. Sculptured with fine growth lines parallel to outer lip, crossed by spiral ribs and grooves which are restricted to the dorsal surface. Columella smooth; outer lip sinuous, thin and sharp. Exterior matt white, interior polished white, apex sometimes purple. Covered with a thin brown periostracum when alive. Size: Up to 28 mm wide. Distribution: Indo-West Pacific; in eastern Australia, as far south as Sydney. Habitat: Unknown, but probably intertidal sand and mud flats. Figs. 1,2: Black Rock, north of Richmond River, NSW (C.358601)
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