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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.

Having the gills covered by the mantle; of or pertaining to the Tectibranchiata. -- n.

Boring, or adapted for boring; -- said of certain Hymenoptera, as the sawflies.

A division of Hymenoptera including those which have an ovipositor adapted for perforating plants. It includes the sawflies.

An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc.

Of or pertaining to the Tetrabranchiata. -- n.

Having the gills situated upon the neck; -- said of certain mollusks.

One of the gill-like breathing organs of certain aquatic insect larvæ. They contain tracheal tubes somewhat similar to those of other insects.

The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes.

One of the Tubulibranchiata.

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

A lower branch.

Having but one gill, as certain molluscs.

Want of remembrance; forgetfulness. I. Watts.

The state of being vibrant; resonance.

Vibrating; tremulous; resonant; as, vibrant drums. Longfellow.

Same as Zygobranchia.

A division of marine gastropods in which the gills are developed on both sides of the body and the renal organs are also paired. The abalone (Haliotis) and the keyhole limpet (Fissurella) are examples.

Of or pertaining to the Zygobranchia.

A means of defense formed by felled trees, the ends of whose branches are sharpened and directed outwards, or against the enemy.