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nate of lime, clay, and sand, in very varivble proportions, and accordingly designated as calcareous, clayey, or sandy. See Greensand.

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

anchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve.

One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes.

One of the small bones or particles of calcareous or other hard substance in the internal ear of vertebrates, and in the auditory organs of many invertebrates; an ear stone. Collectively, the otoliths are called ear sand and otoconite.

One of several upright slender calcareous processes which surround the central part of the calicle of certain corals.

To become stone, or of a stony hardness, as organic matter by calcareous deposits.

A small calcareous concretion formed in a vein; a vein stone.

wimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.

A yellowish-white calcareous freestone from the Isle of Portland in England, much used in building.

he guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone.

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

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

y fishermen. See Illust. under Anomura. -- Sand canal (Zoöl.), a tubular vessel having a calcareous coating, and connecting the oral ambulacral ring with the madreporic tubercle. It appears to be excretory in function. -- Sand cock (Zoöl.), the redshank. [Prov. Eng.] -- Sand collar. (Zoöl.) Same as Sand saucer, below…

The hard calcareous deposit in the tissues of Anthozoa, constituing the stony corals.

A hard chitinous or calcareous process or corpuscle, especially a spicule of the Alcyonaria.

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. -- Scler`o*ba"sic, a.

One of the radial calcareous plates of a coral.

s annelids of the genus Serpula and allied genera of the family Serpulidæ. 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 tu…

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.