. Animal physiology. Physiology, Comparative; Physiology, Comparative. 80 METAMORPHOSIS OF TADPOLES INTO FROGS. Soon after the young tadpole has come forth from the egg, it presents the form which is shown in Fig. 29 : its head and trunk are large, and the latter is prolonged into a flattened tail, by which the little animal swims freely through the water. There is not the least appearance of limbs or members. The gills are long fringes, hanging loosely in the water on either side of the head; and by these the tadpole breathes, as do the aquatic Mollusca. 96. At a later period, however, these
. Animal physiology. Physiology, Comparative; Physiology, Comparative. 80 METAMORPHOSIS OF TADPOLES INTO FROGS. Soon after the young tadpole has come forth from the egg, it presents the form which is shown in Fig. 29 : its head and trunk are large, and the latter is prolonged into a flattened tail, by which the little animal swims freely through the water. There is not the least appearance of limbs or members. The gills are long fringes, hanging loosely in the water on either side of the head; and by these the tadpole breathes, as do the aquatic Mollusca. 96. At a later period, however, these gills, which are merely temporary, disappear ; and the breathing is carried on by another set, which are situated behind the head, and are covered in by a fold of skin ; the water gains access to these by passing through the mouth, exactly as in Fishes. The form is then that which fk. Fro. 30. Fig. 31. Fig. 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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