The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . da. Ordee This order is made up of simple and composite structures, of which the Hy-dra is the type (see text, p. 654). It is distinguished by the absence of anycavity around the stomach ; the wall of the digestive cavity and the ex-ternal integument of the body being merely the inner and outer layers ofthe same membrane. The mouth is surrounded by slender tentacula, whichare beset with little points that seem to have a stinging power; and byFig.
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . da. Ordee This order is made up of simple and composite structures, of which the Hy-dra is the type (see text, p. 654). It is distinguished by the absence of anycavity around the stomach ; the wall of the digestive cavity and the ex-ternal integument of the body being merely the inner and outer layers ofthe same membrane. The mouth is surrounded by slender tentacula, whichare beset with little points that seem to have a stinging power; and byFig. Hydra ? muuih. the agency of these arms the food is grasped and conveyed into the stomach. They are nearly all marine, and are found in all latitudes. In some of the solitary and nearly all the com-posite species, the external integument possesses a horny consistence ; and thus are fonned more or less perfectpolype-cells, within which the body is lodged. The mode in which these structures are increased by gemmationfrequently gives them a very phiiit-like aspect. The Hydra produces buds, which at first project from the side. RADIATA. 701 ?Uf^--^
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
