The common frog . (at least during the day) till the period whenthe young are ripe for quitting the ^g^. Then heseeks water, into which he has not plunged manyminutes when the young burst forth and swim away,and he, having disencumbered himself of the remainsof the ova, resumes his normal appearance. Certain Frogs (forming a very large group) aretermed Tree-Frogs, from their adaptation to arboreallife by means of the dilatation of the ends of thedigits into sucking discs, by which they can adhereto leaves. One of them, the common green Tree-Frog (yHyla arborea), is spread over Europe, Asia,and
The common frog . (at least during the day) till the period whenthe young are ripe for quitting the ^g^. Then heseeks water, into which he has not plunged manyminutes when the young burst forth and swim away,and he, having disencumbered himself of the remainsof the ova, resumes his normal appearance. Certain Frogs (forming a very large group) aretermed Tree-Frogs, from their adaptation to arboreallife by means of the dilatation of the ends of thedigits into sucking discs, by which they can adhereto leaves. One of them, the common green Tree-Frog (yHyla arborea), is spread over Europe, Asia,and Africa, in the same manner as R. escidenta,except that it is not found in the British few toads also have the tips of their digitssimilarly dilated. Such, , is the case with the III.] THE COMMON FROG. 29 genera Kaloida of India, and BracJiymeiiis of SouthAfrica. The female of a pecuHar American Tree-Frog{Nototrema marsiipiatiint) has a pouch extendingover the whole of the back and opening Fig. 10.—The female of Noiotreuia mn>-suhiatujii, uuh trie pou;h partly cut open (alter Giiiither). Into this the eggs are introduced for shelter andprotection. A dorsal pouch also exists in the alliedAmerican genus, Opisthodelphys. An American spe-cies of Hylodes has the habit of lavine its ^^^s intrees singly in the axils of leaves, and the onlywater they can obtain is the drop or two whichmay from time to time be there retained. A still more remarkable mode of protecting the^gg is developed by the Great Toad of tropicalAmerica {Pipa americana). In this case the skin H 30 THE COMMON FROG. [chap. 4 of the females back at the laying season thickensgreatly and becomes of quite a soft and loose tex-ture. The male, as soon as the eggs are laid, takesthem and imbeds them in this thick, soft skin, whichcloses over them. Each <tgg then undergoes itsprocess of development so enclosed, and the tadpolestage is, in this animal, passed within the ^gg, so
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
