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One of the plates which in some Crustacea inclose a cavity wherein the eggs are hatched.

Any one of the bony plates which support the gill covers of fishes; an opercular bone.

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

One who puts in order, arranges, methodizes, or regulates.

Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age. Oriskany period, a subdivision of the American Paleozoic system intermediate or translational in character between the Silurian and Devonian ages. See Chart of Geology.

uating manner; to change repeatedly, back and forth. The amount of superior families oscillates rather than changes, that is, it fluctuates within fixed limits. Dc Quincey.

That oscillates; vibrating; swinging. Oscillating engine, a steam engine whose cylinder oscillates on trunnions instead of being permanently fixed in a perpendicular or other direction. Weale.

A genus of plectognath fishes having the body covered with solid, immovable, bony plates. It includes the trunkfishes.

of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]

One of the plates covering the points of junction at the bend of the shoulders and elbows. Fairholt.

One of a pair of shelly plates that protect the siphon tubes of certain bivalves, as the Teredo. See Illust. of Teredo.

One of the bifurcations of the brachial plates of a crinoid.

One of the numerous small hollow processes of the integument between the plates of starfishes.

art of a discourse or writing; any section or subdivision of a writing or chapter which relates to a particular point, whether consisting of one or many sentences. The division is sometimes noted by the mark

One of the special scales, or plates, covering the back of the head in certain reptiles and fishes.

One who peculates. "Peculators of the public gold." Cowper.

genus of small fishes, having large pectoral fins, and the body covered with hard, bony plates. Several species are known from the East Indies and China.

To form into a peninsula. South River . . . peninsulates Castle Hill farm. W. Bentley.

One who perambulates.

To pass through fine interstices; to filter; as, water percolates through porous stone.