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A group of fossil amphibians allied to the labyrinthodonts, having the head defended by bony, sculptured plates, as in some ganoid fishes.

nal valve, and the optic nerves united by a chiasma. Many of the species are covered with bony plates, or with ganoid scales; others have cycloid scales.

A peculiar bony tissue beneath the enamel of a ganoid scale.

anoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebræ convex in front and concave behind, forming a ball and socket joint. See Ganoidel.

ruptive rock, and used as a pigment by artists; -- called also mountain green. -- Green ebony. (a) A south American tree (Jacaranda ovalifolia), having a greenish wood, used for rulers, turned and inlaid work, and in dyeing. (b) The West Indian green ebony. See Ebony. -- Green fire (Pyrotech.), a composition which bu…

aking flutes and other wind instruments; -- called also Grenada cocos, or cocus, and red ebony.

plectognath fishes (Gymnodontes), having the teeth and jaws consolidated into one or two bony plates, on each jaw, as the diodonts and tetradonts. See Bur fish, Globefish, Diodon.

Ebony. [Obs.] Spenser.

A slender bony or cartilaginous process developed from the heel bone of bats. It helps to support the wing membranes. See Illust. of Cheiropter.

Having permanent horns with a bony core, as cattle.

An extensive division of ganoids, including the gar pike, bowfin, etc.; the bony ganoids. See Illustration in Appendix.

en dinosaur from the Tilgate Forest, England. It was about twenty feet long, protected by bony plates in the skin, and armed with spines.

Of or pertaining to the bony or cartilaginous arch which supports the tongue. Sometimes applied to the tongue itself. Hyoid arch (Anat.), the arch of cartilaginous or bony segments, which connects the base of the tongue with either side of the skull. -- Hyoid bone (Anat.), the bone in the base of the tongue, the middl…

ydes, obtained by the distillation of certain salts of organic acids and consisting of carbonyl (CO) united with two hydrocarbon radicals. In general the ketones are colorless volatile liquids having a pungent ethereal odor.

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.

A large sea turtle (Sphargis coriacea), having no bony shell on its back. It is common in the warm and temperate parts of the Atlantic, and sometimes weighs over a thousand pounds; -- called also leather turtle, leathery turtle, leather-backed tortoise, etc.

A suborder of edentates, covered with bony plates, including the armadillos.

An animal covered with bony scales, as crocodiles among reptiles, and the pangolins among mammals.

A European fish (Peristethus cataphractum), having the body covered with bony plates, and having three spines projecting in front of the nose; -- called also noble, pluck, pogge, sea poacher, and armed bullhead.

anica); also, the fruit of the tree. The fruit is something like a small apple, but has a bony endocarp. When first gathered the flesh is hard and austere, and it is not eaten until it has begun to decay. Japan medlar (Bot.), the loquat. See Loquat. -- Neapolitan medlar (Bot.), a kind of thorn tree (Cratægus Azarolus)…