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Bergmeal :: Bergmeal (n.) An earthy substance, resembling fine flour. It is composed of the shells of infusoria, and in Lapland and Sweden is sometimes eaten, mixed with flour or ground birch bark, in times of scarcity. This name is also given to a white powdery variety of calcite..

Holostraca :: Holostraca (n. pl.) A division of phyllopod Crustacea, including those that are entirely covered by a bivalve shell..

Lithotypy :: Lithotypy (n.) The art or process of making a kind of hard, stereotypeplate, by pressing into a mold, taken from a page of type or other matter, a composition of gum shell-lac and sand of a fine quality, together with a little tar and linseed oil, all in a heated state..

Testudo :: Testudo (n.) A kind of musical instrument. a species of lyre; -- so called in allusion to the lyre of Mercury, fabled to have been made of the shell of a tortoise..

Lunule :: Lunule (n.) A special area in front of the beak of many bivalve shells. It sometimes has the shape of a double crescent, but is oftener heart-shaped. See Illust. of Bivalve..

Unshell :: Unshell (v. t.) To strip the shell from; to take out of the shell; to hatch.

Shill :: Shill (v. t.) To shell.

Striatum :: Striation (n.) A stria; as, the striations on a shell..

Foraminifera :: Foraminifera (n. pl.) An extensive order of rhizopods which generally have a chambered calcareous shell formed by several united zooids. Many of them have perforated walls, whence the name. Some species are covered with sand. See Rhizophoda..

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..

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..

Porcellaneous :: Porcellaneous (a.) Of or pertaining to porcelain; resembling porcelain; as, porcelaneous shells..

Blade :: Blade (n.) The four large shell plates on the sides, and the five large ones of the middle, of the carapace of the sea turtle, which yield the best tortoise shell..

Unilocular :: Unilocular (a.) Having one cell or cavity only; as, a unilocular capsule or shell..

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

Pen :: Pen (n.) The internal shell of a squid.

Tridacna :: Tridacna (n.) A genus of very large marine bivalve shells found on the coral reefs of the Indian and Pacific Oceans. One species (T. gigas) often weighs four or five hundred pounds, and is sometimes used for baptismal fonts. Called also paw shell, and fountain shell..

Septum :: Septum (n.) One of the transverse partitions dividing the shell of a mollusk, or of a rhizopod, into several chambers. See Illust. under Nautilus..

Dental :: Dental (a.) A marine mollusk of the genus Dentalium, with a curved conical shell resembling a tooth. See Dentalium..

Bulimus :: Bulimus (n.) A genus of land snails having an elongated spiral shell, often of large size. The species are numerous and abundant in tropical America..

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