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Semicassis bisulcatum (Schubert & Wagner, 1829)


Description: Shell light to medium in weight. Whorls rounded. Entire shell sculptured with spiral ribs, 25-40 on the body whorl. Outer lip reflected, toothed on the inner edge. Columellar shield strongly lirate, outer margin straight or slightly indented. Umbilicus and false umbilicus open and deep. Background coloration white, cream, pink or blue-grey, sometimes with 4 or 5 spiral bands of brown spots; columella and outer lip white.

Size: Up to 70 mm, typically 55 mm.

Distribution: Indo-West Pacific. In Australia, Dampier Archipelago, WA, to Sydney, NSW.

Habitat: In NSW, known from 30-130 m. Rare in NSW.

Synonyms: Semicassis diuturna Iredale 1927; Xenogalea nashi Iredale, 1931 is based on a subfossil specimen dredged from Sydney Harbour.

Figs. 1,2: Off Sydney in 60-65 fathoms (DLB2865)


Copyright Des Beechey 2000