The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . n, lodged in the substance of the dorsal part of the mantle. The anns of the Dibranchiataare, properly speaking, eight in number ; but in many genera, two longer tentacles are superadded. Both kind*of preliensile organs are provi-ded ivilh acetabula, or suctorialdisks for adhesion. The jaws arehorny, and their margins tren-chant. The eyes are sessile, andof a structure approaching thoseof fishes in perfection. The or-gan of hmring is distinctly deve-loped. Th
The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . n, lodged in the substance of the dorsal part of the mantle. The anns of the Dibranchiataare, properly speaking, eight in number ; but in many genera, two longer tentacles are superadded. Both kind*of preliensile organs are provi-ded ivilh acetabula, or suctorialdisks for adhesion. The jaws arehorny, and their margins tren-chant. The eyes are sessile, andof a structure approaching thoseof fishes in perfection. The or-gan of hmring is distinctly deve-loped. The piiis never exceed twoin number (Fig. 1, br, bi-l,) ; butthe branchial circulation is aidedby two muscular ventricles, situ-ated one at the base of each gill(cb.) ; hence there are three dis-tinct hearts in this order. Thereis an organ, the ink-bag, for secre-ting and expelling a black fluid,used as a means of concealment-The parietes of the funnd are This order is divided by Pro- Fig. 2 Octopvs on fessor Owen into the following families, which are arranged under two tribes, the Octopoda, rrTe the purpose of OUS shell, !. eight-armed, MOLLUSCA.
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1840, booksubjectanimals
