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Updated: July 29, 2025
These are called bi-valves; that is, two valves or shells; and others, like the Garden Snail, the Limpet, and Periwinkle, have one shell only, and so are called uni-valves. The crab, and other crustaceans, also have a hard covering to their soft bodies; but it is not at all like the shell of a Snail, or other mollusc.
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