. Animal physiology. Physiology, Comparative; Physiology, Comparative. to the general rules respecting the teeth of Mammalia, the remark- able Ornithorhyncus, or Duck-billed Platypus of New Holland (Fig. 101). This animal feeds, like the duck, upon the water insects, shell-fish, and aquatic plants, that it obtains from the mud, into which it is continually plunging its singular bill; and its jaws, entirely destitute of teeth, are furnished with horny ridges, by which it can in some degree masticate its food. 186. Among Birds, there is an entire absence of teeth ; and the mechanical division an
. Animal physiology. Physiology, Comparative; Physiology, Comparative. to the general rules respecting the teeth of Mammalia, the remark- able Ornithorhyncus, or Duck-billed Platypus of New Holland (Fig. 101). This animal feeds, like the duck, upon the water insects, shell-fish, and aquatic plants, that it obtains from the mud, into which it is continually plunging its singular bill; and its jaws, entirely destitute of teeth, are furnished with horny ridges, by which it can in some degree masticate its food. 186. Among Birds, there is an entire absence of teeth ; and the mechanical division and the reduction of food is performed in the stomach, in the manner hereafter to be mentioned (§. 200). The mouths of almost all Reptiles, excepting the Turtle tribe, are furnished with numerous teeth; but these are not adapted for much variety of purposes, being principally destined to prevent the escape of the prey which the animals have secured ; and their shape is consequently nearly uniform, being for the most part simply conical. There are some Lizards, however, which are herbivorous; and these have large rough teeth, somewhat resembling the molars of Mammalia. Animals of this tribe attained a gigantic length, not less than from 90 to 120 feet, in past ages of the world.—In Fishes, the teeth are commonly very numerous; but they have for their object only to separate and retain their food ; and there is little variety in their form. Frequently they have no bony attachment, being only held by the gum as in the shark ; and they are conse- quently often torn away, but they are 102.—Head of Gavial (Crocodile of the Ganges).. Fig. 103.—Head of Shark. as readily replaced. a continuation of tl Sometimes, however, the tooth seems like le bone of the jaw, not being in any way. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
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