The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . The ConstellationHydra. hydra posed to the air, and thus making the instru-ment work with great rapidity Cor Hydras. See cori.—Hydra tuba (pi. hydrce t ubtf), in Htjdruzua, n stayein thedevt-lupiiiL-iit of certain Ilisnipjii/ra; as a classifyingname, a larval fnim of such acaluphs, which was supposedto l>e a distinct uuiuial. .See ^ (hi-drakna), «. [NL., < Gr. jmSu/i(ni/j-J, water, + axvi], foam, froth, chaff, Iheleastbit (mite).] 1. A
The century dictionary and cyclopedia, a work of universal reference in all departments of knowledge with a new atlas of the world . The ConstellationHydra. hydra posed to the air, and thus making the instru-ment work with great rapidity Cor Hydras. See cori.—Hydra tuba (pi. hydrce t ubtf), in Htjdruzua, n stayein thedevt-lupiiiL-iit of certain Ilisnipjii/ra; as a classifyingname, a larval fnim of such acaluphs, which was supposedto l>e a distinct uuiuial. .See ^ (hi-drakna), «. [NL., < Gr. jmSu/i(ni/j-J, water, + axvi], foam, froth, chaff, Iheleastbit (mite).] 1. A genus of aearids founded byMidler in 1781, at present restricted to thosefresh-water mites in which the third joint of the. Hyiirachna , adult (line shows natural size); b, mature larva, with form-ing within (highly inagnilied}. palpi is the longest, the beak is as long as thepalpi, and the mandibles have sharp mites are parasitic upon aquatic insects, attachingthemselves to species of Sepa, Uaiuitra, Di/tiKcns, what may be called the pupa-stage. U. belostonueis often found upon bugs of the family llelostamidce, espe-cially Perthogtmna aurantiaca. 2. A genus of water-beetles, of the family Di/-tiacida:, containing such as the European Fuhriciiis, 1801. Hydrachnidse (lii-di-akni-de), n. pi. [ISfL., <Jli/draclnia + -idw.] A family of atiuatic Acari-rfa, typified by the genus Hydrachna; the watev-mites. The skeleton is composed of sclerites embeddedin soft skin, and the body is apparently of the Hiidraclmidte inhabit fresh water, and manyare on mollusks, fishes, and ai^uatic genera besides Hydrachna are Atax, Ilit
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