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f marine gastropod mollusks in which the radula are converted into poison fangs. The cone shells (Conus), Pleurotoma, and Terebra, are examples. See Illust. of Cone, n., 4, Pleurotoma, and Terebra.

An extensive artificial group of gastropods comprising all those which have a spiral shell and the foot attached to the base of the neck.

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.

A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia.

A genus of fresh-water or river turtles which have the shell imperfectly developed and covered with a soft leathery skin. They are noted for their agility and rapacity. Called also soft tortoise, soft-shell tortoise, and mud turtle.

Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms.

e that of a man, and the lower part like that of a fish. He often has a trumpet made of a shell. Have sight of Proteus rising from the sea, Or hear old Triton blow his wreathed horn. Wordsworth.

Anything having three valves, especially a shell.

Top-shaped; having a flat base and conical spire; -- said of certain shells.

Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidæ. Some of the species are called also topshells.

. -- Trumpet ash (Bot.), the trumpet creeper. [Eng.] -- Trumpet conch (Zoöl.), a trumpet shell, or triton. -- Trumpet creeper (Bot.), an American climbing plant (Tecoma radicans) bearing clusters of large red trumpet-shaped flowers; -- called also trumpet flower, and in England trumpet ash. -- Trumpet fish. (Zoöl.)…

Lacking the apex; -- said of certain spiral shells in which the apex naturally drops off. Truncated cone or pyramid (Geom.), a cone or pyramid whose vertex is cut off by a plane, the plane being usually parallel to the base.

A shell or tube formed by an annelid, as a serpula.

A group of gastropod mollusks having a tubular shell. Vermetus is an example.

Any shell belonging to Dolium and allied genera; -- called also tun-shell.

The whole set of whorls of a spiral shell.

ith the whorls decreasing rapidly from a large base to a pointed apex; -- said of certain shells.

A genus of large marine gastropods having a thick heavy shell with conspicuous folds on the columella.

A petrified shell resembling the genus Turbo. [R.]

rous marine gastropods of the genus Turbo or family Turbinidæ, usually having a turbinate shell, pearly on the inside, and a calcareous operculum.