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Colsyrnola sericea Iredale, 1929

Description: Shell very large, tall and moderately slender, spire weakly convex, up to 16 whorls, last whorl about 1/3 of total shell length. Protoconch (type B) coiled, of about 2 whorls, set on teleoconch with axis inclined at about 110 to teleoconch. Teleoconch whorls straight-sided or weakly rounded, suture strongly impressed, whorls smooth, without sculpture. Aperture wide, columella with strong plait, inner lip below plait reflected outwards. Shell opaque, uniform mid-brown.

Size: Up to 26 mm in length.

Distribution: The Australian Museum collection holds specimens from Papua New Guinea, New Caledonia and Australia. In Australia, the range is from Green Island, off Cairns, Qld, southwards to Sydney, NSW and from Broome and North West Shelf, WA.

Habitat: Occasionally from beach washup, but most specimens are from the subtidal, down to 50 m. Very uncommon.

Fig. 1: Sydney Harbour, dredge "Triton" (C.340900).


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