. The biology of the frog. Frogs. THE BIOLOGY OF THE FROG CHAP, Ann Arbor, Michigan, at the following dates: March i5v 1892 ; March 26, 1895 ; March 29, 1896; March 13, 1897; March 28, 1905. The larvae of A. tigrinum were formerly considered a separate species, the axolotl, which was placed in a distinct genus, Siredon, among the perennibranchiate urodeles. Under certain conditions the external gills of this larva may be retained until after the breeding season, and this peculiarity led to its being mistaken for a normal adult form. It has been contended that the metamorphosis of the axolotls
. The biology of the frog. Frogs. THE BIOLOGY OF THE FROG CHAP, Ann Arbor, Michigan, at the following dates: March i5v 1892 ; March 26, 1895 ; March 29, 1896; March 13, 1897; March 28, 1905. The larvae of A. tigrinum were formerly considered a separate species, the axolotl, which was placed in a distinct genus, Siredon, among the perennibranchiate urodeles. Under certain conditions the external gills of this larva may be retained until after the breeding season, and this peculiarity led to its being mistaken for a normal adult form. It has been contended that the metamorphosis of the axolotls could be accelerated if they were forced to breathe air, but Professor Powers has recently shown that the factor of nutrition is probably the most important one, although others are influential, in producing this change, since it usually follows in sufficiently mature larvae upon a sudden diminution of the food supply. The Desmognathinae include three genera, of which Desmognathus is the most common. It contains only three species, all of which are confined to the eastern part of the United States. The species live con- cealed in the day- time under stones or in sheltered nooks where the air is moist. The female FIG. ±-Desmognathus fuscus Female with of/?./«jr«J lays her egg-mass. (After Wilder.) y< eggs in two long strings which she wraps around her body after having resorted to a suitable hiding place. Another representative of this subfamily is Typhlotriton spelceus, a blind species found in a cave in 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 Holmes, Samuel J. (Samuel Jackson), 1868-. New York, London, Macmillan
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