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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..

Cirripedia :: Cirripedia (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa..

Ergot :: Ergot (n.) See 2d Calcar, 3 (b)..

Turbo :: Turbo (n.) Any one of numerous marine gastropods of the genus Turbo or family Turbinidae, usually having a turbinate shell, pearly on the inside, and a calcareous operculum..

Palus :: Palus (n.) One of several upright slender calcareous processes which surround the central part of the calicle of certain corals.

Proostracum :: Proostracum (n.) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone..

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..

Calcified :: Calcified (a.) Consisting of, or containing, calcareous matter or lime salts; calcareous..

Calcariferous :: Calcariferous (a.) Lime-yielding; calciferou.

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..

Tophus :: Tophus (n.) Calcareous tufa.

Petrify :: Petrify (v. i.) To become stone, or of a stony hardness, as organic matter by calcareous deposits..

Marlstone :: Marlstone (n.) A sandy calcareous straum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England..

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

Conglomerate :: Conglomerate (n.) A rock, composed or rounded fragments of stone cemented together by another mineral substance, either calcareous, siliceous, or argillaceous; pudding stone; -- opposed to agglomerate. See Breccia..

Argillo-calcareous :: Argillo-calcareous (a.) Consisting of, or containing, clay and calcareous earth..

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

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

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

Calcaria :: Calcaria (pl. ) of Calca.

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