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Any one of many species of marine gastropods belonging to Triton and allied genera, having a stout spiral shell, often handsomely colored and ornamented with prominent varices. Some of the species are among the largest of all gastropods. Called also trumpet shell, and sea trumpet.

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

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

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

Any spiral marine gastropod belonging to Turritella and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum.

Any marine tectibranchiate gastropod of the genus Umbrella, having an umbrella-shaped shell; -- called also umbrella shell. Umbrella ant (Zoöl.), the sauba ant; -- so called because it carries bits of leaves over its back when foraging. Called also parasol ant. -- Umbrella bird (Zoöl.), a South American bird (Cephalop…

oth are used in medicine. -- Unicorn shell (Zoöl.), any one of several species of marine gastropods having a prominent spine on the lip of the shell. Most of them belong to the genera Monoceros and Leucozonia.

Same as Gastropoda.

A genus of small spiral fresh-water gastropods having an operculum.

Any fresh-water gastropod of the genus Valvata.

A genus including several species of large marine gastropods having massive pyriform shells, with conspicuous folds on the columella.

Any larval gastropod or bivalve mollusk in the state when it is furnished with one or two ciliated membranes for swimming.

Any one of several species of marine gastropods belonging to Velutina and allied genera.

Any one of many species of marine gastropods belonging to Vermetus and allied genera, of the family Vermetidæ. Their shells are regularly spiral when young, but later in life the whorls become separate, and the shell is often irregularly bent and contorted like a worm tube.

A genus of terrestrial gastropods, having transparent, very thin, and delicate shells, -- whence the name.

oid. -- Viviparous shell (Zoöl.), any one of numerous species of operculated fresh-water gastropods belonging to Viviparus, Melantho, and allied genera. Their young, when born, have a well-developed spiral shell.

Any one of numerous species of large, handsome marine gastropods belonging to Voluta and allied genera.

Any aquatic pulmonate gastropod belonging to Planorbis, Limnæa, and allied genera; a pond snail.

Any one numerous species of large marine gastropods belonging to Buccinum and allied genera; especially, Buccinum undatum, common on the coasts both of Europe and North America, and much used as food in Europe. Whelk tingle, a dog whelk. See under Dog.

Any marine gastropod shell of the genus Strombus. See Strombus.