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Shell regularly conical, straight-sided, up to 12-13 whorls; sculpture of regular spiral grooves and ridges traversed by fine prosocline growth lines. Last whorl with prominent peripheral keel bearing two broad ridges; ridges above suture in preceding whorls. Base of shell rather flat, inner lips reflected over shallow umbilical groove (C. zizyphinum-drawing).
Variable. Yellowish, pale pink, or violet with streaks and blotches of brown, red or purple. Blotches on keel generally darker, more frequent and more regular than on other parts of shell. Pure white or violet specimens occasionally found.==References==