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Rhynchonella :: Rhynchonella (n.) A genus of brachiopods of which some species are still living, while many are found fossil..

Lyopomata :: Lyopomata (n. pl.) An order of brachiopods, in which the valves of shell are not articulated by a hinge. It includes the Lingula, Discina, and allied forms..

Palliobranchiate :: Palliobranchiate (a.) Having the pallium, or mantle, acting as a gill, as in brachiopods..

Brachiopoda :: Brachiopoda (n.) A class of Molluscoidea having a symmetrical bivalve shell, often attached by a fleshy peduncle..

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

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.

Spermatophore :: Spermatophore (n.) A capsule or pocket inclosing a number of spermatozoa. They are present in many annelids, brachiopods, mollusks, and crustaceans. In cephalopods the structure of the capsule is very complex..

Waldheimia :: Waldheimia (n.) A genus of brachiopods of which many species are found in the fossil state. A few still exist in the deep sea.

Acephala :: Acephala (n. pl.) That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca..

Articulata :: Articulata (v.) One of the subdivisions of the Brachiopoda, including those that have the shells united by a hinge..

Divaricator :: Divaricator (n.) One of the muscles which open the shell of brachiopods; a cardinal muscle. See Illust. of Brachiopoda.

Orthid :: Orthid (n.) A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidae..

Crania :: Crania (n.) A genus of living Brachiopoda; -- so called from its fancied resemblance to the cranium or skull.

Productus :: Productus (n.) An extinct genus of brachiopods, very characteristic of the Carboniferous rocks..

Deltidium :: Deltidium (n.) The triangular space under the beak of many brachiopod shells.

Lingula :: Lingula (n.) Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix..

Malacozoa :: Malacozoa (n. pl.) An extensive group of Invertebrata, including the Mollusca, Brachiopoda, and Bryozoa. Called also Malacozoaria..

Terebratula :: Terebratula (n.) A genus of brachiopods which includes many living and some fossil species. The larger valve has a perforated beak, through which projects a short peduncle for attachment. Called also lamp shell..

Ecardines :: Ecardines (n. pl.) An order of Brachiopoda; the Lyopomata. See Brachiopoda.

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

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