. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 306 COMPARATIVE ZOOLOGY. 1. Ui'odelans have a naked skin, a tail, and t\vo or four limbs. Some retain their gills tbrongli life, as the Prote- us of Austria, Axolotl {Siredon) of Mexico, and the two-legged Mud-eel {Siren) of South Carolina. Oth- ers drop their gills, and always have four limbs, as the aquatic Newts and land Sal- ;' The fore limbs first make their appearance in the tadpole. 2. Zabyrinthodonts, now extinct, resembled gigantic Salamanders, except in their complex teeth and ex
. Comparative zoology, structural and systematic. For use in schools and colleges. Zoology. 306 COMPARATIVE ZOOLOGY. 1. Ui'odelans have a naked skin, a tail, and t\vo or four limbs. Some retain their gills tbrongli life, as the Prote- us of Austria, Axolotl {Siredon) of Mexico, and the two-legged Mud-eel {Siren) of South Carolina. Oth- ers drop their gills, and always have four limbs, as the aquatic Newts and land Sal- ;' The fore limbs first make their appearance in the tadpole. 2. Zabyrinthodonts, now extinct, resembled gigantic Salamanders, except in their complex teeth and exoskele- ton of bony ])lates. 3. Ccecilians have neither tail nor limbs, a snake-like. -Head and Gills of Menobranchus. Ca- yuga 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 Orton, James, 1830-1877. New York, Harper and brothers
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