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Shell :: Shell (n.) The hard calcareous or chitinous external covering of mollusks, crustaceans, and some other invertebrates. In some mollusks, as the cuttlefishes, it is internal, or concealed by the mantle. Also, the hard covering of some vertebrates, as the armadillo, the tortoise, and the like..

Sheal :: Sheal (n.) A shell or pod.

Sepiostare :: Sepiostare (n.) The bone or shell of cuttlefish. See Illust. under Cuttlefish.

Porcellaneous :: Porcellaneous (a.) Having a smooth, compact shell without pores; -- said of certain Foraminifera..

Heteropoda :: Heteropoda (n. pl.) An order of pelagic Gastropoda, having the foot developed into a median fin. Some of the species are naked; others, as Carinaria and Atlanta, have thin glassy shells..

Discoid :: Discoid (a.) Having the form of a disk, as those univalve shells which have the whorls in one plane, so as to form a disk, as the pearly nautilus..

Bimarginate :: Bimarginate (a.) Having a double margin, as certain shells..

Shell :: Shell (v. i.) To cast the shell, or exterior covering; to fall out of the pod or husk; as, nuts shell in falling..

Shelled :: Shelled (a.) Having a shell.

Varix :: Varix (n.) One of the prominent ridges or ribs extending across each of the whorls of certain univalve shells.

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..

Natica :: Natica (n.) Any one of numerous species of marine gastropods belonging to Natica, Lunatia, Neverita, and other allied genera (family Naticidae.) They burrow beneath the sand, or mud, and drill other shells..

Fig-shell :: Fig-shell (n.) A marine univalve shell of the genus Pyrula, or Ficula, resembling a fig in form..

Shrapnel :: Shrapnel (n.) A shrapnel shell; shrapnel shells, collectively..

Stoolball :: Stool (n.) Material, such as oyster shells, spread on the sea bottom for oyster spat to adhere to..

Fauces :: Fauces (n.pl.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.

Turnip-shell :: Turnip-shell (n.) Any one of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped..

Testaceous :: Testaceous (a.) Of or pertaining to shells; consisted of a hard shell, or having a hard shell..

Nut :: Nut (n.) The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.), consisting of a hard and indehiscent shell inclosing a kernel..

Ear-shell :: Ear-shell (n.) A flattened marine univalve shell of the genus Haliotis; -- called also sea-ear. See Abalone.

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