. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. AMPHIBIANS nature to illustrate to us in a short space of time how the transformation from fishlike to reptilelike forms came about. We have proof, in the fossils of small amphibians from the Gaskohle formation of Bohemia, that some of the very early members of this class underwent a series of. .^^ Fig. 50. Fossil larvae and fossil frog, Paleobatrachus, from the Miocene of Bohemia. .After Wolterstorff and Meyer changes similar to the metamorphosis of the common frog (Fig. 50). In studying the fossil specimens Doctor Frit
. Cold-blooded vertebrates: part I. Fishes. Fishes; Amphibians; Reptiles. AMPHIBIANS nature to illustrate to us in a short space of time how the transformation from fishlike to reptilelike forms came about. We have proof, in the fossils of small amphibians from the Gaskohle formation of Bohemia, that some of the very early members of this class underwent a series of. .^^ Fig. 50. Fossil larvae and fossil frog, Paleobatrachus, from the Miocene of Bohemia. .After Wolterstorff and Meyer changes similar to the metamorphosis of the common frog (Fig. 50). In studying the fossil specimens Doctor Fritsch found some so well preserved as to enable him to recognize the presence of the gills by means of which in their early life they breathed in water like fishes. Once this major step toward land living had been taken, amphibians developed into many forms and great num- bers. They were pioneer vertebrates on a virgin earth. They had no serious competition from outsiders, no ene- mies to prey upon them. In consequence they became for a long period masters of the land. The amphibians living today constitute but a meager remnant of the great race they once were. All this took place in and before the Carboniferous period in which the earliest known amphibian skeletons [162]. 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 Hildebrand, Samuel F. (Samuel Frederick), 1883-1949; Gilmore, Charles Whitney, 1874-; Cochran, Doris M. (Doris Mable), 1898-1968. [New York, Smithsonian institution series, inc. ]
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Keywords: ., bookcentury1900, booksubj, booksubjectfishes, booksubjectreptiles
