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Any small crustacean. In a wider sense, the word is often loosely applied to various small invertebrates.

Between the epimeral plates of insects and crustaceans.

Between the sternal; -- said of certain membranes or parts of insects and crustaceans.

The third joint or the antennæ of the Crustacea.

The third joint of the typical appendages of Crustacea.

An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.

general equilibrium in the earth's crust, supposed to be maintained by the yielding or flow of rock material beneath the surface under gravitative stress. By the theory of isostasy each unit column of the earth, from surface to center, has approximately the same weight, and the continents stand higher than the ocean be…

To seize with the teeth; to gnaw. "Knabbing crusts." [Obs.] L'Estrange.

An organ in insects and crustaceans covering the upper part of the mouth, and serving as an upper lip. See Illust. of Hymenoptera.

A division of amphipod Crustacea, in which the abdomen is small or rudimentary and the legs are often reduced to five pairs. The whale louse, or Cyamus, and Caprella are examples.

An order of Crustacea, including Nebalia and allied forms.

A suborder of copepod Crustacea, including a large number of remarkable forms, mostly parasitic on fishes. The young, however, are active and swim freely. See Illustration in Appendix.

One of a family (Lernæidæ) of parasitic Crustacea found attached to fishes and other marine animals. Some species penetrate the skin and flesh with the elongated head, and feed on the viscera. See Illust. in Appendix.

he character of a cell wall, by which it becomes harder. It is supposed to be due to an incrustation of lignin.

Any large macrurous crustacean used as food, esp. those of the genus Homarus; as the American lobster (H. Americanus), and the European lobster (H. vulgaris). The Norwegian lobster (Nephrops Norvegicus) is similar in form. All these have a pair of large unequal claws. The spiny lobsters of more southern waters, belongi…

To cover with some protecting substance, as with lute, a crust, coating, or plates.

Any small crustacean parasitic on fishes. See Branchiura, and Ichthvophthira.

A genus of free-swimming macruran Crustacea, having a slender body and long appendages.

A subdivision of decapod Crustacea, having the abdomen largely developed. It includes the lobster, prawn, shrimp, and many similar forms. Cf. Decapoda.

A subclass of Crustacea, including Arthrostraca and Thoracostraca, or all those higher than the Entomostraca.