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Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

Calcispongiae :: Calcispongiae (n. pl.) An order of marine sponges, containing calcareous spicules. See Porifera..

Lady :: Lady (n.) The triturating apparatus in the stomach of a lobster; -- so called from a fancied resemblance to a seated female figure. It consists of calcareous plates.

Calcaria :: Calcaria (pl. ) of Calca.

Serpula :: Serpula (n.) Any one of numerous species of tubicolous annelids of the genus Serpula and allied genera of the family Serpulidae. They secrete a calcareous tube, which is usually irregularly contorted, but is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts..

Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..

Calcify :: Calcify (v. t.) To make stony or calcareous by the deposit or secretion of salts of lime.

Concretion :: Concretion (n.) A rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay..

Thinolite :: Thinolite (n.) A calcareous tufa, in part crystalline, occurring on a large scale as a shore deposit about the Quaternary lake basins of Nevada..

Phlebolith :: Phlebolith (n.) A small calcareous concretion formed in a vein; a vein stone.

Synaptase :: Synapta (n.) A genus of slender, transparent holothurians which have delicate calcareous anchors attached to the dermal plates. See Illustration in Appendix..

Testicardines :: Testicardines (n. pl.) A division of brachiopods including those which have a calcareous shell furnished with a hinge and hinge teeth. Terebratula and Spirifer are examples.

Calcar :: Calcar (n.) A spur, or spurlike prominence..

Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

Rhabdolith :: Rhabdolith (n.) A minute calcareous rodlike structure found both at the surface and the bottom of the ocean; -- supposed by some to be a calcareous alga.

Coccolith :: Coccolith (n.) One of a kind of minute, calcareous bodies, probably vegetable, often abundant in deep-sea mud..

Sclerenchyma :: Sclerenchyma (n.) The hard calcareous deposit in the tissues of Anthozoa, constituting the stony corals..

Tooth :: Tooth (n.) Any hard calcareous or chitinous organ found in the mouth of various invertebrates and used in feeding or procuring food; as, the teeth of a mollusk or a starfish..

Lithophyte :: Lithophyte (n.) A hard, or stony, plantlike organism, as the gorgonians, corals, and corallines, esp. those gorgonians having a calcareous axis. All the lithophytes except the corallines are animals..

Calcar :: Calcar (n.) A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit..

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