CONTENTS. 



Letter to Professor Hayden 



lutroduction : on the significance of paleontological science 



PART I. 



On tbc classification and distribution of tlio Cretaceons deposits of the West. 



PART II. 



Descriptions of the Cretaceons Vertebrata of the West 



1. Description of the localities and fauna 



2. Literature of the Reptilia 



3. Descriptions of the Reptilia 



4. Li terature of the Fishes 



5. Descriptions of the Fishes 



PART III. 



Synopsis of tlu- known Cretaceous Vertebrata of North America 



Page. 



15 



42 

 42 

 51 

 53 

 179 

 180 



245 



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