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Crossea concinna Angas, 1868

Description: Shell small, thick and solid, last whorl very convex. Protoconch elevated, smooth, with well-defined junction to teleoconch. Teleoconch up to 4 whorls, early whorls strongly keeled, giving way to close-spaced, smooth, spiral threads, 30-40 on last whorl; interspaces regularly pitted. Umbilicus narrow, edged with a very strong cord, itself bearing threads as the rest of the whorls. Aperture circular, entire, with weak posterior canal and broad, shallow anterior canal crossing the lip callus. Outer lip thin, thickened internally before the edge in mature shells. Inner lip of aperture reflected to partly or completely cover umbilicus. Colour white.

Size: Up to 6 mm in height.

Distribution: Endemic to Australia: Caloundra, Queensland, southwards and around southern Australia to South Australia, including Tasmania.

Habitat: Empty shells are from beach washup and down to 146 m. Common.

Synonymy: Crossea consobrina May, 1916 is a synonym.

Fig. 1: Bottle and Glass Rocks, Sydney Harbour (C.334316)


Copyright Des Beechey 2009