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Although fossil amphibia have long been known and have been the subject of innumerable and often very excellent works, no systematic attempt to determine their relations to one another and to the living amphibia has ever been made. Many authors have, of course, discussed the taxonomic position of individual types, and drawn up classifications which express their views of relationships.

I. The structure, evolution and origin of the amphibia. - The "orders' rachitomi and stereospondyli