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Bursa granularis (Roding, 1798)

Description: Shell compressed dorso-ventrally, whorls shouldered, convex below shoulder, flat or concave above shoulder. Body whorl sculptured with about 10 beaded spiral ribs with intermediate riblets; shoulder ribs sometimes nodulose. Varices strong, spaced every half whorl, forming a varical ridge down each side or the shell. Inner margin of outer lip with about 10-14 denticles, some paired; columella plicate throughout its length. Anterior canal short; posterior canal forms a deep groove at the posterior end of the aperture. Exterior colour fawn or reddish-brown; interior, outer lip and columella white. Operculum oval, corneous.

Size: Up to 85 mm in length, typically 40-50 mm.

Distribution: Indo-West Pacific; in Australia, Cape Naturaliste, south-western WA, to Sydney, NSW.

Habitat: Intertidal on coral reefs and rocky shores. Common in the tropics, rare in NSW.

Figs. 1,2: Long Reef, Collaroy, NSW (C.081994)


Copyright Des Beechey 2000