. Cassell's natural history. Animals; Animal behavior. Till-: In their habits, as in their structure, they arc most various. Tlius a consideral>lf nuiiiljer, of which the common Chkese Mitk {Tijror/hjiihns doincsticng) may be taken as the type, li\e either in dry or decaying animal and \egetable materials, or upon the roots of plants, such «s LiliaceiB (between the scales), potatoes, dahlias, Ac, or in Agarics. Cheese, ilour, and sugar are also favourite substances with these little creatures. The members of tlie genus llypopus and its allies, distinguished by having the two jui
. Cassell's natural history. Animals; Animal behavior. Till-: In their habits, as in their structure, they arc most various. Tlius a consideral>lf nuiiiljer, of which the common Chkese Mitk {Tijror/hjiihns doincsticng) may be taken as the type, li\e either in dry or decaying animal and \egetable materials, or upon the roots of plants, such «s LiliaceiB (between the scales), potatoes, dahlias, Ac, or in Agarics. Cheese, ilour, and sugar are also favourite substances with these little creatures. The members of tlie genus llypopus and its allies, distinguished by having the two juiterior pairs of feet fairly or well develoi)ed, while the two hinder pairs are small and concealed beneatli the body, are found externally parasitic upon a variety of insects, and also occasionally upon vertebrate animals. Hi/poderas, â on the contrary, the species of which have a more or less elongated body, with two pairs of legs issuing from close to the anterior end, and two pairs from much fiirther back, includes internal parasites, some of them living under the skin, or in the muscles of various vertebrate animals, and others in their bronchial tubes and lungs, or in the air-cells which exist under the skin in ' many birds. Occasionally these minute parasites occur in immense numbers. A very considerable number of species, belonging to the genus Sarcoptes and its allies, are parasitic in the skins of various vertebrates, upon which they cause the disease commonly known in man as " the ; They are generally of a broadly ovate or rounded figure, with the skin more or less distinctly striated across, and furnished witli the usual four pairs of legs, placed half towards the front and half towards the posterior part of the body, the legs generally having several bristles, and terminating in a slender tarsal part with a sucker at the end. The chelicerae are" nipper-like, and it is by the agency of these that the parasites burrow beneath the epidermis of th
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Keywords: ., bookcentury1800, bookdecade1890, booksubjecta, booksubjectanimals
