. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 35.—Water-Newt. The perfect form of the Frog is shown. Fig. 36.—Axolotl. 97. It has been said that the Frog itself under- goes a more complete meta- morphosis than others of the group. Thus in the Water- Newt (Fig. 35), the tail is retained during the whole of life, and the animal con- tinues to be an inhabitant of the water, though breathing air alone. There are some very curious animals, however, in which the change is stopped, as it were, at a much earlier period, so that the gills also are retained ; and in these,
. Animal physiology. Physiology, Comparative; Physiology, Comparative. Fig. 35.—Water-Newt. The perfect form of the Frog is shown. Fig. 36.—Axolotl. 97. It has been said that the Frog itself under- goes a more complete meta- morphosis than others of the group. Thus in the Water- Newt (Fig. 35), the tail is retained during the whole of life, and the animal con- tinues to be an inhabitant of the water, though breathing air alone. There are some very curious animals, however, in which the change is stopped, as it were, at a much earlier period, so that the gills also are retained ; and in these, the lungs are sufficiently developed to enable the animals to breathe air, so that they can live either on land or in water, and are thus truly amphibious. In Fig. 36 is represented an animal of this kind, the Axolotl, which inhabits some of the lakes of Mexico. And in Fig. 37 is shown. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
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