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f officers, but in which there are few enlisted men. -- Skeleton shrimp (Zoöl.), a small crustacean of the genus Caprella. See Illust. under Læmodipoda.

Any terrestrial isopod crustacean of the genus Porcellio and allied genera; a sow bug.

The act of casting off the skin or shell, as do insects and crustaceans; ecdysis.

ng a number of spermatozoa. They are present in many annelids, brachiopods, mollusks, and crustaceans. In cephalopods the structure of the capsule is very complex.

The scale, or exopodite, of an antenna of a crustacean.

Any one of numerous stomapod crustaceans of the genus Squilla and allied genera. They make burrows in mud or beneath stones on the seashore. Called also mantis shrimp. See Illust. under Stomapoda.

The peduncle of the eyes of decapod crustaceans.

ed on a stalk, or peduncle; -- opposed to sessile-eyed. Said especially of podophthalmous crustaceans. Stalked- eyed crustaceans. (Zoöl.) See Podophthalmia.

The second joint of a maxilla of an insect or a crustacean.

An order of Crustacea including the squillas. The maxillipeds are leglike in form, and the large claws are comblike. They have a large and elongated abdomen, which contains a part of the stomach and heart; the abdominal appendages are large, and bear the gills. Called also Gastrula, Stomatopoda, and Squilloidea.…

ated above, or on the dorsal side of, the esophagus; as, the supra-esophageal ganglion of Crustacea. [Written also supra- oesophagal, and supra-oesophageal.]

A seam, or impressed line, as between the segments of a crustacean, or between the whorls of a univalve shell. Glover's suture, Harmonic suture, etc. See under Glover, Harmonic, etc.

sually bilobed, appendages, of which several pairs occur on the abdominal somites of many crustaceans. They are used as fins in swimming.

The foot of an insect or a crustacean. It usually consists of form two to five joints.

The terminal joint or movable piece at the end of the abdomen of Crustacea and other articulates. See Thoracostraca.

Any species of Thalaassinidæ, a family of burrowing macrurous Crustacea, having a long and soft abdomen.

An extensive division of Crustacea, having a dorsal shield or carapec

The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix.…

vision of arthropods comprising all those which breathe by tracheæ, as distinguished from Crustacea, which breathe by means of branchiæ.

The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes.