. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. B FIG. 233.—POISON-FANGS OF A VIPERINE SNAKE. A, skull of Rattlesnake ; B, transverse section through about the middle of the poison-fang of Vipera ammodytes ; C, transverse section through the poison- fang of Vipera ammodytes near its distal end. (B and C after Leydig.) GO, poison-canal; Gz, poison-fang ; PH. pulp-cavity ; Hz, reserve fangs. (Hesperornis). The premaxilla? were toothless, and seem to have possessed a horny beak. The single-pointed teeth of Archaeopteryx were probably situated in alveoli. Mammals. In Mamma
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. B FIG. 233.—POISON-FANGS OF A VIPERINE SNAKE. A, skull of Rattlesnake ; B, transverse section through about the middle of the poison-fang of Vipera ammodytes ; C, transverse section through the poison- fang of Vipera ammodytes near its distal end. (B and C after Leydig.) GO, poison-canal; Gz, poison-fang ; PH. pulp-cavity ; Hz, reserve fangs. (Hesperornis). The premaxilla? were toothless, and seem to have possessed a horny beak. The single-pointed teeth of Archaeopteryx were probably situated in alveoli. Mammals. In Mammals, a shortening of the jaws, which results in an increase in their power and a diminution in the number of teeth, has taken place along with a higher differentiation of the individual tooth and a reduction in the number of tooth-generations. The heterodont condition which characterises Mammals, as a Avhole, has arisen from a more primitive homodont condition, and the teeth have become adapted in various ways in correspondence with. 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 the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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