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The fresh-water sponges. See Spongilla.

aving a cylindrical body with a terminal anal opening, and usually with one or two caudal gills.

The highest division, or subclass, of gastropod mollusks, including those that have the gills situated anteriorly, or forward of the heart, and the sexes separate.

An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida.

of aquatic eel-shaped amphibians found in caves in Austria. They have permanent external gills as well as lungs. The eyes are small and the legs are weak.

A rudimentary branchia, or gill. -- Pseu`do*bran"chi*al, a.

Of or pertaining to pugillism.

A quarter. Specifically: (a) The fourth part of a pint; a gill.

or mineral vein traversing the strata vertically, or nearly so; -- called also rake-vein. Gill rakes. (Anat.) See under 1st Gill.

See Gill rakers, under 1st Gill.

siol.) See 2d Note under Food, n., 1. -- Respiratory tree (Zoöl.), the branched internal gill of certain holothurians.

A genus of tubiculous annelids having a circle of plumose gills around head.

axilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity.

Having the gills protected by a shieldlike shell; of or pertaining to the Scutibranchiata. -- n.

A genus of oceanic nudibranchiate mollusks having the small branched gills situated on the upper side of four fleshy lateral lobes, and on the median caudal crest.

is sometimes spirally coiled. The worm has a wreath of plumelike and often bright-colored gills around its head, and usually an operculum to close the aperture of its tube when it retracts.

the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata.

a. They cling to rocks between high and low water marks and have both lunglike organs and gills. -- Si`pho*na"rid, a.

er, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group.

Having a siphon, or siphons, to convey water to the gills; belonging or pertaining to the Siphonobranchiata. -- n.