Arnold Edward Ortmann was a pioneering paleontologist and geologist who made important contributions to our understanding of fossilized reptiles and amphibians. This volume collects many of his most important papers on these subjects, including detailed descriptions of new species and analyses of their evolutionary relationships. This book is an important resource for scholars and students of paleontology and geology. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.