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One of the Brachiopoda, or its shell.

A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle.

-- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

One of the subdivisions of the Brachiopoda, including those that have the shells united by a hinge.

A genus of living Brachiopoda; -- so called from its fancied resemblance to the cranium or skull.

A name formerly given to certain Silurian brachiopod shells of the genus Spirifer. Delthyris limestone (Geol.), one of the divisions of the Upper Silurian rocks in New York.

The triangular space under the beak of many brachiopod shells.

One of the muscles which open the shell of brachiopods; a cardinal muscle. See Illust. of Brachiopoda.

An order of Brachiopoda; the Lyopomata. See Brachiopoda.

The peduncle or stem by which various marine animals are attached, as certain brachiopods and goose barnacles.

Without a hinge; -- said of an order (Inarticulata or Ecardines) of brachiopods.

ss, or tin, for softening or obstructing the light of a lamp. -- Lamp shell (Zoöl.), any brachiopod shell of the genus Terebratula and allied genera. The name refers to the shape, which is like that of an antique lamp. See Terebratula. -- Safety lamp, a miner's lamp in which the flame is surrounded by fine wire gauze…

Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix. Lingula flags (Geol.), a group of strata in the lower Silurian or Cambrian system of Wales, in which some of the layers contain vast numbers of a species of Lingula.…

An order of brachiopods, in which the valves of shell are not articulated by a hinge. It includes the Lingula, Discina, and allied forms. [Written also Lyopoma.]

An extensive group of Invertebrata, including the Mollusca, Brachiopoda, and Bryozoa. Called also Malacozoaria.

A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.

A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidæ.

An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.

Same as Brachiopoda.

Having the pallium, or mantle, acting as a gill, as in brachiopods.