generally more or less hardened by the deposition of calcareous matter, breathing by means of gills.

(Examples, Crab, Lobster, Shrimp, etc.)

CURCULIO. — The old generic term for the Beetles known as Weevils, characterised by their four-jointed feet, and by the head being produced into a sort of beak, upon the sides of which the antennae are inserted.

CUTANEOUS. — Of or belonging to the skin.

DEGRADATION. — The wearing down of land by the action of the sea or of meteoric agencies.

DENUDATION. — The wearing away of the surface of the land by water.

DEVONIAN SYSTEM or FORMATION. — A series of Palaeozoic rocks, including the Old Red Sandstone.