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Socienna crassa (Laseron, 1951)

Description (based on syntypes): Shell medium is size for the family, conical, moderately wide. Protoconch eroded, very large and blunt, of about 1 whorl, with indistinct junction with teleoconch. Teleoconch of 78 whorls, very weakly convex in outline, suture distinct. Whorls sculptured with 3 strong spiral cords with interspaces equal to width of cords. Spiral cords crossed by strong axial ribs, forming more or less circular beads at intersections; about 16 axials on last whorl. Base with spiral 4 level with top of aperture, smooth, concave below. Outer lip of aperture broken in both syntypes; inner lip with heavy white callus. Anterior canal oblique, a deep U-shaped notch. Shell semitranslucent, fawn to mid-brown.

Size: Larger syntype 3.8 mm in length.

Distribution: Syntypes from Manly Beach, Sydney, NSW. Further material available (5 lots): Fingal Bay, Port Stephens; Narrabeen Beach; Middle Harbour; Manly; Cronulla.

Habitat: All specimens are from beach washup.

Figs.1, 2: Manly Beach, Sydney, NSW (C.102742 SYNTYPE)


Copyright Des Beechey 2016