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A chitinous membrane covering the exterior of many shells; -- called also epidermis.

The lip, or edge of the aperture, of a spiral shell.

The edge of the aperture of a univalve shell.

Any small marine gastropod shell of the genus Littorina. The common European species (Littorina littorea), in Europe extensively used as food, has recently become naturalized abundantly on the American coast. See Littorina.

ed oblique perspective; when parallel to that face, parallel perspective. -- Perspective shell (Zoöl.), any shell of the genus Solarium and allied genera. See Solarium.

mbition. It was similar to the ostracism in Athens; but olive leaves were used instead of shells for ballots.

A kind of shell marble occurring in the Wealden clay at Petworth, in Sussex, England; -- called also Sussex marble.

The thin chambered shell attached to the anterior end of a belemnite. [Written also phragmacone.]

A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.

urrowing, South American edentate (Chlamyphorus truncatus), allied to the armadillos. The shell is attached only along the back. [Written also pichyciego.]

The pulverized shells of oysters used in making walks. [Eng.] Simmonds.

ngitudinally triple-winged and ciliated, the mouth covered with a lid shaped like a cockleshell. -- California pitcher plant, the Darlingtonia California. See Darlingtonia. -- Pitcher plant, any plant with the whole or a part of the leaves transformed into pitchers or cuplike organs, especially the species of Nepenth…

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.

fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.

The ventral shield or shell of tortoises and turtles. See Testudinata.

A slope or sloping toward the front; as, the plongée of a parapet; the plongée of a shell in its course. [Sometimes written plonge.]

A division of Foraminifera including those having a manychambered shell.

Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

A California harvest fish (Stromateus simillimus), highly valued as a food fish. Pompano shell (Zoöl.), a small bivalve shell of the genus Donax; -- so called because eaten by the pompano. [Florida]

n printing, the transferring of an impression of an engraving to porcelain. -- Porcelain shell (Zoöl.), a cowry.