The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . of degradation, lodged in the substance of the dorsal part of the mantle. The arms of the Dibranchiataare, properly speaking, eight in nimiber ; but m many gciier i t^\o longer tentacles are superadded. Both kindsof prehensUe organs are provi-ded with 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 oihearing is distinctly de
The animal kingdom, arranged after its organization : forming a natural history of animals, and an introduction to comparative anatomy . of degradation, lodged in the substance of the dorsal part of the mantle. The arms of the Dibranchiataare, properly speaking, eight in nimiber ; but m many gciier i t^\o longer tentacles are superadded. Both kindsof prehensUe organs are provi-ded with 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 oihearing is distinctly deve-loped. The piJJs never exceed twoin number (Fig. 1, hr, 6cl,) ; 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 inh-bag, for secre-ting and expelling a black fluid,used as a means of parietes of the funnel areentire. This order is divided by Pro- Fig. 2 Ocrnprs on fessor Owen into the foUomng families, which are arranged under two tribes, the Octopoda, or eight-armed,. 668 MOLLUSCA.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjecta, booksubjectzoology
