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Crustalogist :: Crustalogist (n.) One versed in crustalogy.

Palingenesy :: Palingenesy (n.) That form of evolution in which the truly ancestral characters conserved by heredity are reproduced in development; original simple descent; -- distinguished from kenogenesis. Sometimes, in zoology, the abrupt metamorphosis of insects, crustaceans, etc..

Basipodite :: Basipodite (n.) The basal joint of the legs of Crustacea.

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

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

Kissingcrust :: Kissingcrust (n.) The portion of the upper crust of a loaf which has touched another loaf in baking.

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

Endosternite :: Endosternite (n.) The part of each apodeme derived from the intersternal membrane in Crustacea and insects.

Ommatidium :: Ommatidium (n.) One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates..

Eczema :: Eczema (n.) An inflammatory disease of the skin, characterized by the presence of redness and itching, an eruption of small vesicles, and the discharge of a watery exudation, which often dries up, leaving the skin covered with crusts; -- called also tetter, milk crust, and salt rheum..

Epizoon :: Epizoon (n.) One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoon. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans..

Pagurian :: Pagurian (n.) Any one of a tribe of anomuran crustaceans, of which Pagurus is a type; the hermit crab. See Hermit crab, under Hermit..

Occrustate :: Occrustate (v. t.) To incrust; to harden.

Crust :: Crust (n.) The hard exterior or surface of bread, in distinction from the soft part or crumb; or a piece of bread grown dry or hard..

Stalk :: Stalk (n.) The peduncle of the eyes of decapod crustaceans.

Eschara :: Eschara (n.) A genus of Bryozoa which produce delicate corals, often incrusting like lichens, but sometimes branched..

Brachyura :: Brachyura (n. pl.) A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. [Also spelt Brachyoura.] See Crab, and Illustration in Appendix..

Illinition :: Illinition (n.) A thin crust of some extraneous substance formed on minerals.

Incrustate :: Incrustate (a.) Incrusted.

Thorax :: Thorax (n.) 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..

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