Contents- 



Part I The Origins and Affinities of the Land and Freshwater Fauna 



of Western North America 



1 Evolution of Modern Surface Features of Western North 



America 



Philip B. King 3 



2 Climate Since the Late Cretaceous 



H. D. MacGinitie 61 



3 The Role of Physiology in the Distribution of Terrestrial 



Vertebrates 

 George A. Bartholomew 81 



4 Evidence from Fossil Land Mammals on the Origin and 



Affinities of Western Nearctic Fauna 



Donald E. Savage 97 



5 The History and Affinities of the Recent Land Mammals 



of Western North America 



William H. Burt 131 



6 Origin and Affinities of the Birds of Western North 



America (Editor's Note) 



Alden H. Miller 155 



7 Origin and Affinities of the Present Western North 



American Reptile and Amphibian Fauna (Abstract) 



Robert C. Stebbins 157 



8 Evolution of a Coast Range Corridor in California and 



Its Effect on the Origin and Dispersal of Living 

 Amphibians and Reptiles 



Frank E. Peabody and Jay M. Savage 159 



9 Origin and Affinities of the Freshwater Fish Fauna of 



Western North America 



Robert Rush Miller 187 



10 Some Problems of Freshwater Invertebrate Distribution 

 in the Western States 



Robert W. Pennak 223 



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