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Jaw′-foot, a foot-jaw, maxilliped; Jaw′-lē′ver, an instrument for opening the mouth of a horse or cow to admit medicine; Jaw′-tooth, one of the double teeth, a grinder or molar.—Break-jaw word, a very long word, or one hard to pronounce; Hold one's jaw, to cease from talking or scolding.

Assuming a swimmeret of the third, fourth, or fifth somite to be the least changed from the primitive type, what changes were necessary to make the sixth swimmeret; the third maxilliped; the walking legs; the antenn�; the antennules?Remove the part of the carapace which covers a gill chamber.

Thus when a wave of water escapes from the branchial cavity, it immediately becomes diffused in this network of hairs and then again conveyed back to the branchial cavity by vigorous movements of the appendage of the outer maxilliped which works in the entrant fissure.