from The Century Dictionary and Cyclopedia

  • n. One of the invertebrate organisms whose skeletons essentially contribute to the formation of rock masses. Many classes of the invertebrates have at one time or another acted as rock-builders on account of the profusion of their exuviæ. Chief among them are the Foraminifera Radiolaria, corals, and corallines; less prominent are sponges, crinoids, brachiopods, and pelecypods.


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