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Any species of Pleurotomaria, a genus of beautiful, pearly, spiral gastropod shells having a deep slit in the outer lip. Many fossil species are known, and a few living ones are found in deep water in tropical seas.

Any one of numerous species of terrestrial air-breathing gastropods belonging to the genus Helix and many allied genera of the family Helicidæ. They are abundant in nearly all parts of the world except the arctic regions, and feed almost entirely on vegetation; a land sanil.

The anterior prolongation of the head of a gastropod; -- called also rostrum.

al cord and pass forward into the skull, from which they emerge in company with the pneumogastrics. -- Spinal column, the backbone, or connected series or vertebræ which forms the axis of the vertebrate skeleton; the spine; rachis; vertebral column. -- Spinal cord, the great nervous cord extending backward from the b…

Any marine gastropod of the genus Fusus. Dead spindle (Mach.), a spindle in a machine tool that does not revolve; the spindle of the tailstock of a lathe. -- Live spindle (Mach.), the revolving spindle of a machine tool; the spindle of the headstock of a turning lathe. -- Spindle shell. (Zoöl.) See Spindle, 7. above.…

Any marine gastropod shell of the genus Apporhais having an elongated siphon. See Illust. under Rostrifera.

Any one of several species of handsome gastropod shells of the genus Trochus, or Imperator. The shell is conical, with the margin toothed somewhat like the rowel of a spur.

Any one of numerous species of small fishes of the genus Gasterosteus and allied genera. The back is armed with two or more sharp spines. They inhabit both salt and brackish water, and construct curious nests. Called also sticklebag, sharpling, and prickleback.

avity in which digestion takes place in an animal; a digestive cavity. See Digestion, and Gastric juice, under Gastric.

Of or pertaining to the stomach; gastric.

he stomach and heart; the abdominal appendages are large, and bear the gills. Called also Gastrula, Stomatopoda, and Squilloidea.

An extensive division of gastropod Mollusca in which the loop or visceral nerves is twisted, and the sexes separate. It is nearly to equivalent to Prosobranchiata.

A genus of marine gastropods in which the shell has the outer lip dilated into a broad wing. It includes many large and handsome species commonly called conch shells, or conchs. See Conch.

An extensive division of gastropod mollusks in which the odontophore is long and narrow, and usually bears seven rows of teeth. It includes a large number of families both marine and fresh- water.

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.

A genus of marine gastropods having a long, tapering spire. They belong to the Toxoglossa. Called also auger shell.

A division of 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.

The loosely woven substance which lines the chambers within the gleba in certain Gasteromycetes.

h live upon, and suck the sap of, trees and shrubs. They belong to Arma, Pentatoma, Rhaphigaster, and allied genera. -- Tree cat (Zool.), the common paradoxure (Paradoxurus musang). -- Tree clover (Bot.), a tall kind of melilot (Melilotus alba). See Melilot. -- Tree crab (Zoöl.), the purse crab. See under Purse. --…