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Trachystomata :: Trachystomata (n. pl.) An order of tailed aquatic amphibians, including Siren and Pseudobranchus. They have anterior legs only, are eel-like in form, and have no teeth except a small patch on the palate. The external gills are persistent through life..

Tetrabranchiata :: Tetrabranchiata (n. pl.) 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..

Beard :: Beard (v. t.) To oppose to the gills; to set at defiance.

Pedata :: Pedata (n. pl.) An order of holothurians, including those that have ambulacral suckers, or feet, and an internal gill..

Ceratobranchia :: Ceratobranchia (n. pl.) A group of nudibranchiate Mollusca having on the back papilliform or branched organs serving as gills.

Lamellibranchiate :: Lamellibranchiate (a.) Having lamellar gills; belonging to the Lamellibranchia.

Pseudobranchia :: Pseudobranchia (n.) A rudimentary branchia, or gill..

Lugworm :: Lugworm (n.) A large marine annelid (Arenicola marina) having a row of tufted gills along each side of the back. It is found burrowing in sandy beaches, both in America and Europe, and is used for bait by European fishermen. Called also lobworm, and baitworm..

Pleurobranch :: Pleurobranch (n.) Any one of the gills of a crustacean that is attached to the side of the thorax.

Analogue :: Analogue (n.) An organ which is equivalent in its functions to a different organ in another species or group, or even in the same group; as, the gill of a fish is the analogue of a lung in a quadruped, although the two are not of like structural relations..

Ghyll :: Ghyll (n.) A ravine. See Gill a woody glen.

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

Tadpole :: Tadpole (n.) The young aquatic larva of any amphibian. In this stage it breathes by means of external or internal gills, is at first destitute of legs, and has a finlike tail. Called also polliwig, polliwog, porwiggle, or purwiggy..

Gill :: Gill (n.) One of the combs of closely ranged steel pins which divide the ribbons of flax fiber or wool into fewer parallel filaments.

Jill :: Jill (n.) A young woman; a sweetheart. See Gill.

Siphonobranchiata :: Siphonobranchiata (n. pl.) A tribe of gastropods having the mantle border, 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..

Siphonobranchiate :: Siphonobranchiate (a.) Having a siphon, or siphons, to convey water to the gills; belonging or pertaining to the Siphonobranchiata..

Dibranchiata :: Dibranchiata (n. pl.) An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. See Cephalopoda..

Carinaria :: Carinaria (n.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills..

Notobranchiata :: Notobranchiata (n. pl.) A division of nudibranchiate mollusks having gills upon the back.

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