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Sabella :: Sabella (n.) A genus of tubicolous annelids having a circle of plumose gills around the head.

Lepidosiren :: Lepidosiren (n.) An eel-shaped ganoid fish of the order Dipnoi, having both gills and lungs. It inhabits the rivers of South America. The name is also applied to a related African species (Protopterus annectens). The lepidosirens grow to a length of from four to six feet. Called also doko..

Stock :: Stock (n.) Any cruciferous plant of the genus Matthiola; as, common stock (Matthiola incana) (see Gilly-flower); ten-weeks stock (M. annua)..

Gill :: Gill (n.) The fleshy flap that hangs below the beak of a fowl; a wattle.

Siren :: Siren (n.) Any long, slender amphibian of the genus Siren or family Sirenidae, destitute of hind legs and pelvis, and having permanent external gills as well as lungs. They inhabit the swamps, lagoons, and ditches of the Southern United States. The more common species (Siren lacertina) is dull lead-gray in color, and becames two feet long..

Finch :: Finch (n.) A small singing bird of many genera and species, belonging to the family Fringillidae..

Operculum :: Operculum (n.) The principal opercular bone in the upper and posterior part of the gill cover.

Potamospongiae :: Potamospongiae (n. pl.) The fresh-water sponges. See Spongilla.

Persistent :: Persistent (a.) Remaining beyond the period when parts of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous..

Tristoma :: Tristoma (n.) Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes..

Nudibranchiata :: Nudibranchiata (n. pl.) A division of opisthobranchiate mollusks, having no shell except while very young. The gills are naked and situated upon the back or sides. See Ceratobranchia..

Scaphognathite :: Scaphognathite (n.) A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity.

Pint :: Pint (n.) A measure of capacity, equal to half a quart, or four gills, -- used in liquid and dry measures. See Quart..

Trematodea :: Trematodea (n. pl.) An extensive order of parasitic worms. They are found in the internal cavities of animals belonging to all classes. Many species are found, also, on the gills and skin of fishes. A few species are parasitic on man, and some, of which the fluke is the most important, are injurious parasites of domestic animals. The trematodes usually have a flattened body covered with a chitinous skin, and are furnished with two or more suckers for adhesion. Most of the species are hermaphrodi

Pellibranchiata :: Pellibranchiata (n. pl.) A division of Nudibranchiata, in which the mantle itself serves as a gill..

Lophobranchii :: Lophobranchii (n. pl.) An order of teleostean fishes, having the gills arranged in tufts on the branchial arches, as the Hippocampus and pipefishes..

Argillite :: Argillite (n.) Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc..

Badiaga :: Badiaga (n.) A fresh-water sponge (Spongilla), common in the north of Europe, the powder of which is used to take away the livid marks of bruises..

Mantle :: Mantle (n.) The external fold, or folds, of the soft, exterior membrane of the body of a mollusk. It usually forms a cavity inclosing the gills. See Illusts. of Buccinum, and Byssus..

Argillo-calcareous :: Argillo-calcareous (a.) Consisting of, or containing, clay and calcareous earth..

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