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Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Coralline :: Coralline (n.) A submarine, semicalcareous or calcareous plant, consisting of many jointed branches..

Corneocalcareous :: Corneocalcareous (a.) Horny on one side and calcareous on the other.

Septum :: Septum (n.) One of the radial calcareous plates of a coral.

Calcareo-argillaceous :: Calcareo-argillaceous (a.) consisting of, or containing, calcareous and argillaceous earths..

Calcaria :: Calcaria (pl. ) of Calca.

Calcar :: Calcar (n.) A curved ridge in the floor of the leteral ventricle of the brain; the calcar avis, hippocampus minor, or ergot..

Calcareo-siliceous :: Calcareo-siliceous (a.) Consisting of, or containing calcareous and siliceous earths..

Synarchy :: Synapticula (n.) One of numerous calcareous processes which extend between, and unite, the adjacent septa of certain corals, especially of the fungian corals..

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..

Micaceo-calcareous :: Micaceo-calcareous (a.) Partaking of the nature of, or consisting of, mica and lime; -- applied to a mica schist containing carbonate of lime..

Calcification :: Calcification (n.) The process of change into a stony or calcareous substance by the deposition of lime salt; -- normally, as in the formation of bone and of teeth; abnormally, as in calcareous degeneration of tissue..

Cartilaginous :: Cartilaginous (a.) Having the skeleton in the state of cartilage, the bones containing little or no calcareous matter; said of certain fishes, as the sturgeon and the sharks..

Ossicle :: Ossicle (n.) One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes..

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..

Calcite :: Calcite (n.) Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar..

Sclerobase :: Sclerobase (n.) The calcareous or hornlike coral forming the central stem or axis of most compound alcyonarians; -- called also foot secretion. See Illust. under Gorgoniacea, and Coenenchyma..

Retepore :: Retepore (n.) Any one of several species of bryozoans of the genus Retepora. They form delicate calcareous corals, usually composed of thin fenestrated fronds..

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

Diaphragm :: Diaphragm (n.) A calcareous plate which divides the cavity of certain shells into two parts.

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