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Image of Acirsa antarctica (E. A. Smith 1907)
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Acirsa antarctica (E. A. Smith 1907)

Description

provided by NMNH Antarctic Invertebrates

SCALA ANTARCTICA.

(Pl. I., figs. 10-10b.)

Shell small, elongate, imperforate, dirty whitish, greyish towards the upper part of the spire; whorls 7-8, very convex, divided by a somewhat oblique suture, exhibiting fine lines of growth and thickened varices, one or two upon each whorl; last whorl obtusely keeled around the base; apex blunt, globose; aperture roundly ovate; peristome thickened and a little expanded.

Length, 10 millim.; diam., 3.5; aperture, 2.5 long.

Hole 12. In 25-30 fathoms.

Remarkable on account of the smooth, rounded whorls, and thickened varices. When closely examined, the dirty whitish colour is seen to be composed of numerous irregularly interrupted spiral and longitudinal lines; producing a minutely cancellated appearance (see fig. 10b). Operculum normal (fig. 10a), yellowish, horny, redder in the

centre”

(Smith, 1907: 8)