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A genus of very large fossil amphibians, of the Triassic period, having bony plates on the under side of the body. It is the type of the order Labyrinthodonta. Called also Mastodonsaurus.

most reptiles; an appendage of the sacculus, corresponding to the cochlea, in fishes and amphibians.

Having a single heart, as fishes and amphibians. -- n.

nd mud in the water can settle for removal. -- Mud eel (Zoöl.), a long, slender, aquatic amphibian (Siren lacertina), found in the Southern United States. It has persistent external gills and only the anterior pair of legs. See Siren. -- Mud frog (Zoöl.), a European frog (Pelobates fuscus). -- Mud hen. (Zoöl.) (a) T…

ument, usually supported by bony plates, which protects the gills of most fishes and some amphibians; the gill cover; the gill lid.

An order of tailless amphibians having a slender, wormlike body with regular annulations, and usually with minute scales imbedded in the skin. The limbs are rudimentary or wanting. It includes the cæcilians. Called also Gymnophiona and Ophidobatrachia.

coid (often closely united with the clavicle) in the shoulder girdle of many reptiles and amphibians.

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

A genus 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.

The first and undivided part of the aortic trunk in the amphibian heart. -- Py*lan"gi*al, a.

The ova or spawn of fishes and amphibians, especially when still inclosed in the ovarian membranes. Sometimes applied, loosely, to the sperm and the testes of the male.

A small bone between the nasal septum and the maxilla in many reptiles and amphibians.

Any long, slender amphibian of the genus Siren or family Sirenidæ, 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 f…

An extinct order of amphibians found fossil in the Mesozoic rocks; called also Stegocephali, and Labyrinthodonta.

The divided part beyond the pylangium in the aortic trunk of the amphibian heart. -- Syn*an"gi*al, a.

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.

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.

-- Tree tiger (Zoöl.), a leopard. -- Tree toad (Zoöl.), any one of numerous species of amphibians belonging to Hyla and allied genera of the family Hylidæ. They are related to the common frogs and toads, but have the tips of the toes expanded into suckers by means of which they cling to the bark and leaves of trees.…

An order of amphibians having the tail well developed and often long. It comprises the salamanders, tritons, and allied animals.

liform process forming the posterior extremity of the vertebral column in some fishes and amphibians.