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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.

Solenogastra :: Solenogastra (n. pl.) An order of lowly organized Mollusca belonging to the Isopleura. A narrow groove takes the place of the foot of other gastropods.

Mollusc :: Mollusc (n.) Same as Mollusk.

Cirrus :: Cirrus (n.) The external male organ of trematodes and some other worms, and of certain Mollusca..

Conchifera :: Conchifera (n. pl.) That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.

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..

Osphradium :: Osphradium (n.) The olfactory organ of some Mollusca. It is connected with the organ of respiration.

Molluscoid :: Molluscoid (a.) Resembling the true mollusks; belonging to the Molluscoidea.

Streptothrix :: Streptoneura (n. pl.) An extensive division of gastropod Mollusca in which the loop or visceral nerves is twisted, and the sexes separate. It is nearly to equivalent to Prosobranchiata..

Molluscoidea :: Molluscoidea (n. pl.) A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.

Bojanus Organ :: Bojanus organ () A glandular organ of bivalve mollusca, serving in part as a kidney..

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

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

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

Tectibranchiata :: Tectibranchiata (n. pl.) An order, or suborder, of gastropod Mollusca in which the gills are usually situated on one side of the back, and protected by a fold of the mantle. When there is a shell, it is usually thin and delicate and often rudimentary. The aplysias and the bubble shells are examples..

Carinaria :: Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..

Molluscum :: Molluscum (n.) A cutaneous disease characterized by numerous tumors, of various forms, filled with a thick matter; -- so called from the resemblance of the tumors to some molluscous animals..

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..

Bryozoa :: Bryozoa (n. pl.) A class of Molluscoidea, including minute animals which by budding form compound colonies; -- called also Polyzoa..

Sublapsarian :: Subkingdom (n.) One of the several primary divisions of either the animal, or vegetable kingdom, as, in zoology, the Vertebrata, Tunicata, Mollusca, Articulata, Molluscoidea, Echinodermata, Coelentera, and the Protozoa; in botany, the Phanerogamia, and the Cryptogamia..

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