Clypeastrid

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A family of irregular sea urchins, flattened into a discoidal or shield like shape, with a mouth central and furnished with a masticatory apparatus.

Keywords

shell, sea, snail, ocean

Galleries

Sea Urchins and Sea Stars

Source

William & Robert Chambers Encyclopaedia - A Dictionary of Universal Knowledge for the People (Philadelphia, PA: J. B. Lippincott & Co., 1881)

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