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Any species of Lingula.

Any species of Dentalium and allied genera having a tooth- shaped shell. See Dentalium.

Any one of numerous species of marine top_shaped shells of the genus Thochus, or family Trochidæ.

A shell longer than a deck-piercing shell, with thinner walls and a larger cavity for the bursting charge, which consists of about 130 pounds of high explosive. It has no soft cap, and is intended to effect its damage by the powerful explosion which follows on slight resistance. It is used chiefly in 12-inch mortars.…

Any bivalve shell of the genus Mactra. See Mactra.

Any bivalve mollusk which secretes a shelly tube around its siphon, as the watering-shell.

A large, handsomely colored, marine univalve shell (Fasciolaria tulipa) native of the Southern United States. The name is sometimes applied also to other species of Fasciolaria.

A sea urchin when deprived of its spines; -- popularly so called from a fancied resemblance to a turban.

Any one of several large, thick, spiral marine shells belonging to Rapa and allied genera, somewhat turnip-shaped.

The turtle cowrie.

See 2d Tusk, n., 2.

To strip the shell from; to take out of the shell; to hatch.

Any fresh-water gastropod of the genus Valvata.

merous species of small marine bivalves belonging to Donax and allied genera in which the shell is wedge-shaped.

Any one of various species of marine bivalve shells belonging to the genus Avicula, in which the hinge border projects like a wing.

Any species of Vermetus.

A marine shell of the genus Turbo. See Turbo.

A univalve mollusk of the genus Haliotis. The shell is lined with mother-of-pearl, and used for ornamental purposes; the sea-ear. Several large species are found on the coast of California, clinging closely to the rocks.

That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca.

See Acorn-shell.