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substance, consisting of plates overlapping each other, and it has a group of long sharp spines on each wing which are used as defensive organs. It is a shy bird, and runs with great rapidity. Other species inhabit New Guinea, Australia, etc.

A dingy blue, or grayish black, variety of spinel. It is also called pleonaste. [Written also ceylonite.]

swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head.

A very extensive order of Annelida, characterized by the presence of lateral setæ, or spines, on most or all of the segments. They are divided into two principal groups: Oligochæta, including the earthworms and allied forms, and Polychæta, including most of the marine species.

The backbone or spine of an animal; the back. "And chine with rising bristles roughly spread." Dryden.

lo. It is covered with a leathery shell or coat of mail, like a cloak, attached along the spine.

A musical instrument, formerly in use, in form of a spinet; -- called also manichord and clavichord.

ntic ocean (Dutes auriga); -- called also charioteer. The name refers to a long, lashlike spine of the dorsal fin.

Having hollow spines, as some ganoid fishes.

Girt about the spire with a row of tubercles or spines; -- said of spiral shells.

Circle of curvature. See Osculating circle of a curve, under Circle. -- Curvature of the spine (Med.), an abnormal curving of the spine, especially in a lateral direction. -- Radius of curvature, the radius of the circle of curvature, or osculatory circle, at any point of a curve.

, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial.

A large, spine-tailed lizard (Uromastix spinipes), found in Egypt, Arabia, and Palestine; -- called also dhobb, and dhabb.

Pertaining to, or in relation with, both dermal and hæmal structures; as, the dermohæmal spines or ventral fin rays of fishes.

ertaining to, or in relation with, both dermal and neural structures; as, the dermoneural spines or dorsal fin rays of fishes. Owen.

any fish of the genus Acanthurus; the surgeon fish; -- so called from a sharp lancetlike spine on each side of the tail. Also called barber fish. See Surgeon fish.

A variety of the zinc spinel or gahnite.

tremata found in Australia, Tasmania, and New Guinea. They are toothless and covered with spines; -- called also porcupine ant-eater, and Australian ant-eater.

less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid. [Written also Echinidea, and Echinoida.]

Set with small spines or prickles.