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Entomostraca :: Entomostraca (n. pl.) One of the subclasses of Crustacea, including a large number of species, many of them minute. The group embraces several orders; as the Phyllopoda, Ostracoda, Copepoda, and Pectostraca. See Copepoda, Phyllopoda, and Cladocera..

Rock :: Rock (n.) Any natural deposit forming a part of the earth's crust, whether consolidated or not, including sand, earth, clay, etc., when in natural beds..

Loricate :: Loricate (v. t.) To cover with some protecting substance, as with lute, a crust, coating, or plates..

Procrustean :: Procrustean (a.) Of or pertaining to Procrustes, or the mode of torture practiced by him; producing conformity by violent means; as, the Procrustean treatment; a Procrustean limit. See Procrustes..

Ichthyophthira :: Ichthyophthira (n. pl.) A division of copepod crustaceans, including numerous species parasitic on fishes..

Trichobranchia :: Trichobranchia (n.) The gill of a crustacean in which the branchial filaments are slender and cylindrical, as in the crawfishes..

Podophthalmia :: Podophthalmia (n. pl.) The stalk-eyed Crustacea, -- an order of Crustacea having the eyes supported on movable stalks. It includes the crabs, lobsters, and prawns. Called also Podophthalmata, and Decapoda..

Anisopoda :: Anisopoda (n. pl.) A division of Crustacea, which, in some its characteristics, is intermediate between Amphipoda and Isopoda..

Chitin :: Chitin (n.) A white amorphous horny substance forming the harder part of the outer integument of insects, crustacea, and various other invertebrates; entomolin..

Endophragma :: Endophragma (n.) A chitinous structure above the nervous cord in the thorax of certain Crustacea.

Scud :: Scud (n.) Any swimming amphipod crustacean.

Silicon :: Silicon (n.) A nonmetalic element analogous to carbon. It always occurs combined in nature, and is artificially obtained in the free state, usually as a dark brown amorphous powder, or as a dark crystalline substance with a meetallic luster. Its oxide is silica, or common quartz, and in this form, or as silicates, it is, next to oxygen, the most abundant element of the earth's crust. Silicon is characteristically the element of the mineral kingdom, as carbon is of the organic world. Symbol Si. A

Zaratite :: Zaratite (n.) A hydrous carbonate of nickel occurring as an emerald-green incrustation on chromite; -- called also emerald nickel.

Prawn :: Prawn (n.) Any one of numerous species of large shrimplike Crustacea having slender legs and long antennae. They mostly belong to the genera Pandalus, Palaemon, Palaemonetes, and Peneus, and are much used as food. The common English prawn is Palaemon serratus..

Maxilliped :: Maxilliped (n.) One of the mouth appendages of Crustacea, situated next behind the maxillae. Crabs have three pairs, but many of the lower Crustacea have but one pair of them. Called also jawfoot, and foot jaw..

Aptera :: Aptera (n. pl.) Insects without wings, constituting the seventh Linnaen order of insects, an artificial group, which included Crustacea, spiders, centipeds, and even worms. These animals are now placed in several distinct classes and orders..

Hypostoma :: Hypostoma (n.) The lower lip of trilobites, crustaceans, etc..

Telson :: Telson (n.) The terminal joint or movable piece at the end of the abdomen of Crustacea and other articulates. See Thoracostraca.

Metanauplius :: Metanauplius (n.) A larval crustacean in a stage following the nauplius, and having about seven pairs of appendages..

Wernerian :: Wernerian (a.) Of or pertaining to A. G. Werner, The German mineralogist and geologist, who classified minerals according to their external characters, and advocated the theory that the strata of the earth's crust were formed by depositions from water; designating, or according to, Werner's system..

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