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Shell sculptured with two rows of strong nodules on centre of body whorl and one row at lower third of spire whorls; whole surface overlaid with fine spiral cords and irregular axial growth lines. Columella wide, smooth, outer lip thin and simple. Colour grey, nodules fawn or white, aperture fawn or brown with two white bands within. Operculum corneous. Size: Up to 26.8 mm in length; commonly less than 15 mm.
On exposed coasts and moderately sheltered shores, near and above high tide level, sheltering in pits and crevices. Specimens have been recorded living at 10 m above the high tide mark. Abundant.
These shells have an attitude of sitting on top of each other like that of a cheer dance pyramid and maybe that's where it got its name.