. Text-book of zoology for schools and colleges. Zoology. Fig. 121.—a. Diagrammatic Section of the Eye of a Viper (after Cloquet). a Eyeball; J Optic nerve; c Chamber into which the tears are poured; d Epidermic layer covering the eye. B, Head of the common Viper (after Bell), showing the poison-fangs. curved fangs, one on each maxiUa or upper jawbone, which, when not in use, are pointed backward, and concealed in a fold of the gum, but can be raised at will by special muscles. Each tooth is perforated by a fine canal or tube, which opens by a distinct aperture at the point of the fang, and is
. Text-book of zoology for schools and colleges. Zoology. Fig. 121.—a. Diagrammatic Section of the Eye of a Viper (after Cloquet). a Eyeball; J Optic nerve; c Chamber into which the tears are poured; d Epidermic layer covering the eye. B, Head of the common Viper (after Bell), showing the poison-fangs. curved fangs, one on each maxiUa or upper jawbone, which, when not in use, are pointed backward, and concealed in a fold of the gum, but can be raised at will by special muscles. Each tooth is perforated by a fine canal or tube, which opens by a distinct aperture at the point of the fang, and is connect- ed with the duct of the " ; Tiis is a gland, situated under and behind the eye, secreting the poisonous fluid which renders the bites of these snakes dangerous or fatal. When the serpent strikes at any animal, the poison is forced through the poison-fang into the wound, partly by the contractions of the muscular walls of the gland, and partly by the compressive action of the muscles of the jaws. In some other snakes, several of which are not certainly known to be. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
