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Polythalamous :: Polythalamous (a.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

Venus :: Venus (n.) Any one of numerous species of marine bivalve shells of the genus Venus or family Veneridae. Many of these shells are large, and ornamented with beautiful frills; others are smooth, glossy, and handsomely colored. Some of the larger species, as the round clam, or quahog, are valued for food..

Beak :: Beak (n.) The prolongation of certain univalve shells containing the canal.

Rice-shell :: Rice-shell (n.) Any one of numerous species of small white polished marine shells of the genus Olivella.

Chilostomata :: Chilostomata (n. pl.) An extensive suborder of marine Bryozoa, mostly with calcareous shells. They have a movable lip and a lid to close the aperture of the cells..

Turtle-shell :: Turtle-shell (n.) The turtle cowrie.

Toothshell :: Toothshell (n.) Any species of Dentalium and allied genera having a tooth-shaped shell. See Dentalium.

Siphonostomata :: Siphonostomata (n. pl.) An artificial division of gastropods including those that have siphonostomatous shells.

Toxoglossa :: Toxoglossa (n.pl.) A division of marine gastropod mollusks in which the radula are converted into poison fangs. The cone shells (Conus), Pleurotoma, and Terebra, are examples. See Illust. of Cone, n., 4, Pleurotoma, and Terebra..

Marron :: Marron (a.) A paper or pasteboard box or shell, wound about with strong twine, filled with an explosive, and ignited with a fuse, -- used to make a noise like a cannon..

Fuze :: Fuze (n.) A tube, filled with combustible matter, for exploding a shell, etc. See Fuse, n..

Concho-spiral :: Concho-spiral (n.) A kind of spiral curve found in certain univalve shells.

Lip :: Lip (n.) One of the edges of the aperture of a univalve shell.

Cymbium :: Cymbium (n.) A genus of marine univalve shells; the gondola.

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

Escalop :: Escalop (n.) A bivalve shell of the genus Pecten. See Scallop.

Wentletrap :: Wentletrap (n.) Any one of numerous species of elegant, usually white, marine shells of the genus Scalaria, especially Scalaria pretiosa, which was formerly highly valued; -- called also staircase shell. See Scalaria..

Apodeme :: Apodeme (n.) One of the processes of the shell which project inwards and unite with one another, in the thorax of many Crustacea..

Cockle :: Cockle (n.) A cockleshell.

Sounding :: Sounding (n.) The sand, shells, or the like, that are brought up by the sounding lead when it has touched bottom..

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