BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 23, pp. 155-266 JUNE 1, 1912 



PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



SYMPOSIUM ON TEN YEARS' PROGRESS IN VERTEBRATE 



PALEONTOLOGY ^ 



R. S. Bassler, Secretary 



{Held hy the Society December 29, 1911) 



CONTENTS 



Page 



Introduction 155 



African mammals ; by W. D. Matthew 156 



Artiodactyla ; by O. A. Peterson 162 



Perissodactyla ; by J. W. Gidley 179 



Carnivora and Rodentia ; by W. D. Matthew 181 



Marsupials, lusectivores, and Primates ; by W. K. Gregory 187 



Marine mammals ; by F. W. True 197 



Paleozoic Reptilia and Amphibia ; by E. C. Case 200 



Jurassic dinosaurs ; by W. J. Holland 204 



Cretaceous dinosaurs ; by R. S. Lull 208 



Chelonia ; by O. P. Hay 212 



Marine reptiles ; by J. C. Merriam 221 



Paleozoic fishes ; by Bashford Dean 224 



Mesozoic and Cenozoic fishes ; by C. R. Eastman 228 



Correlation and paleogeography ; by H. F. Osborn 232 



Evolutionary evidences ; by S. W. Williston 257 



Contributions to geologic theory and method by American workers in 



vertebrate paleontology^ ; by W, J. Sinclair 262 



INTRODUCTION 



For the third annual meeting of the Paleontological Society, held at 

 Washington, it was suggested by several members of the Council that a 

 portion of one day might well be devoted to a Symposium on Ten Years' 

 Progress in Vertebrate Paleontology. This was approved by the remain- 

 ing members, and the Secretary was instructed to arrange such a sym- 

 posium, following an outline which had been submitted by Vice-President 

 W. D. Matthew. As the time limit on these papers had necessarily to be 



1 Received by the Secretary of the Geological Society of America January 31, 1912. 

 XII — Bull. Geol. Soc. Am., Vol. 23, 1911 / 155\ 



