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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..

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

Cone :: Cone (n.) A shell of the genus Conus, having a conical form..

Conchometer :: Conchometer (n.) An instrument for measuring shells, or the angle of their spire..

Osselet :: Osselet (n.) The internal bone, or shell, of a cuttlefish..

Argonauta :: Argonauta (n.) A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

Whorl :: Whorl (n. & v.) A volution, or turn, of the spire of a univalve shell..

Turtlehead :: Turtlehead (n.) An American perennial herb (Chelone glabra) having white flowers shaped like the head of a turtle. Called also snakehead, shell flower, and balmony..

Eggshell :: Eggshell (n.) A smooth, white, marine, gastropod shell of the genus Ovulum, resembling an egg in form..

Ioqua Shell :: Ioqua shell () The shell of a large Dentalium (D. pretiosum), formerly used as shell money, and for ornaments, by the Indians of the west coast of North America..

Tusk-shell :: Tusk-shell (n.) See 2d Tusk, n., 2..

Petalism :: Petalism (n.) A form of sentence among the ancient Syracusans by which they banished for five years a citizen suspected of having dangerous influence or ambition. It was similar to the ostracism in Athens; but olive leaves were used instead of shells for ballots.

Ambitus :: Ambitus (n.) The exterior edge or border of a thing, as the border of a leaf, or the outline of a bivalve shell..

Cirripedia :: Cirripedia (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa..

Reprimer :: Reprimer (n.) A machine or implement for applying fresh primers to spent cartridge shells, so that the shells be used again..

Lamella :: Lamella (n.) a thin plate or scale of anything, as a thin scale growing from the petals of certain flowers; or one of the thin plates or scales of which certain shells are composed..

Phragmocone :: Phragmocone (n.) The thin chambered shell attached to the anterior end of a belemnite.

Turreted :: Turreted (a.) Furnished with a turret or turrets; specifically (Zool.), having the whorls somewhat flattened on the upper side and often ornamented by spines or tubercles; -- said of certain spiral shells..

Vitrina :: Vitrina (n.) A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, -- whence the name..

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.

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