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Attenuata archensis (May, 1913)

Description: Shell stout, solid, spire convex. Protoconch of 1 whorls, with about 8 weak spiral threads, and distinct junction with teleoconch. Teleoconch up to 3 rounded whorls. Spiral sculpture of low, wide cords, 2 or 3 on first whorl, increasing to 4 or 5 on second-last whorl; further 6 cords on base of last whorl. Aperture nearly circular, anterior canal broad, without posterior channel. Outer lip of aperture expanded, with strong varix externally; inner lip reflected over a narrow umbilical slit. Colour opaque white.

Size: Up to 3.0 m in length.

Distribution: Endemic to Australia: Sydney, NSW, southwards to Tasmania.

Habitat: On the continental shelf, 45-150 m deep. Rare (9 lots in Australian Museum Collection, 3 from NSW).

Synonymy: None.

Fig. 1: Off Sydney, 150 m deep (C.135035)

Fig. 2: Original figure from May, 1913


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