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Syconium :: Sycones (n. pl.) A division of calcareous sponges.

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..

Longspur :: Longspur (n.) Any one of several species of fringilline birds of the genus Calcarius (or Plectrophanes), and allied genera. The Lapland longspur (C. Lapponicus), the chestnut-colored longspur (C. ornatus), and other species, inhabit the United States..

Dissepiment :: Dissepiment (n.) One of the transverse, calcareous partitions between the radiating septa of a coral..

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..

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..

Calcify :: Calcify (v. i.) To become changed into a stony or calcareous condition, in which lime is a principal ingredient, as in the formation of teeth..

Corallum :: Corallum (n.) The coral or skeleton of a zoophyte, whether calcareous of horny, simple or compound. See Coral..

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

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

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

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

Corneocalcareous :: Corneocalcareous (a.) Formed of a mixture of horny and calcareous materials, as some shells and corals..

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

Sclerite :: Sclerite (n.) A hard chitinous or calcareous process or corpuscle, especially a spicule of the Alcyonaria..

Hepar :: Hepar (n.) Any substance resembling hepar proper, in appearance; specifically, in homeopathy, calcium sulphide, called also hepar sulphuris calcareum (/)..

Tophus :: Tophus (n.) Calcareous tufa.

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..

Tufa :: Tufa () A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa..

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.

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