. The biology of the amphibia. Amphibians. 450 THE BIOLOGY OF THE AMPHIBIA. A second land bridge, frequently postulated to explain the distribution of higher groups such as the mammals, connected. 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 Noble, Gladwyn Kingsley, 1894-1940. New York : McGraw-Hill

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Keywords: ., bookcentury1900, bookpublishernewyorkmcgr, booksubjectamphibians