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A young larval form of many annelids, mollusks, and bryozoans, in which a circle of cilia is developed around the anterior end.

One of the siphons of a bivalve mollusk. Capillary tube, a tube of very fine bore. See Capillary. -- Fire tube (Steam Boilers), a tube which forms a flue. -- Tube coral. (Zoöl.) Same as Tubipore. -- Tube foot (Zoöl.), one of the ambulacral suckers of an echinoderm. -- Tube plate, or Tube sheet (Steam Boilers), a fl…

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

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

and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form of a sac, pier…

nterpres). They are so called from their habit of turning up small stones in search of mollusks and other aquatic animals. Called also brant bird, sand runner, sea quail, sea lark, sparkback, and skirlcrake. Black turnstone, the California turnstone (Arenaria melanocephala). The adult in summer is mostly black, except…

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.

A fold of the wall which projects into the cavity of the intestine in bivalve mollusks, certain annelids, starfishes, and some other animals.

n purple, or Tyrian dye, a celebrated purple dye prepared in ancient Tyre from several mollusks, especially Ianthina, Murex, and Purpura. See the Note under Purple, n., 1, and Purple of mollusca, under Purple, n.

A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.

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

An extensive tribe of bivalve mollusks of which the genus Venus is the type. The shells are usually oval, or somewhat heartshaped, with a conspicuous lunule. See Venus.

The external male organ of certain mollusks, worms, etc. See Illustration in Appendix.

g food and in fighting. It is hunted for its oil, ivory, and skin. It feeds largely on mollusks. Called also morse.

A kind of mollusk, a whelk. [Prov. Eng.]

oot so modified as to form a pair of winglike swimming organs; -- said of the pteropod mollusks.

k owl, the short-eared owl (Asio brachyotus). -- Woodcock shell, the shell of certain mollusks of the genus Murex, having a very long canal, with or without spines. -- Woodcock snipe. See under Snipe.

in, or destroying, wood; -- said especially of certain insect larvæ, crustaceans, and mollusks.