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Amphineura :: Amphineura (n. pl.) A division of Mollusca remarkable for the bilateral symmetry of the organs and the arrangement of the nerves.

Unibranchiate :: Unibranchiate (a.) Having but one gill, as certain molluscs..

Mollusk :: Mollusk (n.) One of the Mollusca.

Bivalve :: Bivalve (n.) A mollusk having a shell consisting of two lateral plates or valves joined together by an elastic ligament at the hinge, which is usually strengthened by prominences called teeth. The shell is closed by the contraction of two transverse muscles attached to the inner surface, as in the clam, -- or by one, as in the oyster. See Mollusca..

Mollusca :: Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

Encephalous :: Encephalous (a.) Having a head; -- said of most Mollusca; -- opposed to acephalous.

Conchology :: Conchology (n.) The science of Mollusca, and of the shells which they form; malacology..

Molluscan :: Molluscan (a.) Of or pertaining to mollusks.

Molluscoidal :: Molluscoidal (a.) Molluscoid.

Cambrian :: Cambrian (a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.

Scaphopda :: Scaphopda (n. pl.) A class of marine cephalate Mollusca having a tubular shell open at both ends, a pointed or spadelike foot for burrowing, and many long, slender, prehensile oral tentacles. It includes Dentalium, or the tooth shells, and other similar shells. Called also Prosopocephala, and Solenoconcha..

Gastropoda :: Gastropoda (n. pl.) One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, and the land and fresh-water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See Mollusca..

Molluscous :: Molluscous (a.) Molluscan.

Hepato-pancreas :: Hepato-pancreas (n.) A digestive gland in Crustacea, Mollusca, etc., usually called the liver, but different from the liver of vertebrates..

Epipodial :: Epipodial (a.) Pertaining to the epipodium of Mollusca.

Ostrea :: Ostrea (n.) A genus of bivalve Mollusca which includes the true oysters.

Lamellibranchiata :: Lamellibranchiata (n. pl.) A class of Mollusca including all those that have bivalve shells, as the clams, oysters, mussels, etc..

Placophora :: Placophora (n. pl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura..

Geophila :: Geophila (n. pl.) The division of Mollusca which includes the land snails and slugs.

Opisthobranchiata :: Opisthobranchiata (n. pl.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs..

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