CONTENTS. 



Frontispiece, Reptiles of the Kansas Cretaceous Ocean. page. 



Members of the University Geological Survey 3 



Letter of Transmission 5 



Dedication 7 



Preface 9 



PART I. — The Upper Cretaceous of Kansas: a Historical Review. By 



George I. Adams 13 



Addenda, by S. W. Williston 28 



Plates i to iv 33-39 



PART II.— Birds. By S. W. Williston 41 



Birds of the Niobrara 44 



Bird Tracks from the Dakota 50 



Explanation of Plates 55 



Plates v to vin 57-63 



PART III.— Dinosaurs. By S. W. Williston 65 



Plate ix 71 



PART IV.— Crocodiles. By S. W. Williston 73 



PART V.— Mosasaurs. By S. W. Williston 81 



History 83 



Range and Distribution 87 



Comparative Anatomical Descriptions 100 



Systematic Descriptions 169 



Restoration of the Kansas Mosasaurs 209, 347 



Explanation of Plates .217 



Plates x to lxxii 223-347 



PART VI.— Turtles 349 



Introduction. By S. W. Williston 351 



Desmatochelys. Bv S. W. Williston 353 



Toxochelys. By E* C. Case 370 



Explanation of Plates 387 



Plates lxxiii to lxxxiv 389-411 



PART VII. — Microscopic Organisms of the Upper Cretaceous. By 



C. E. McClung 413 



Plate lxxxv 429 



PART VIII.— The Invertebrates of the Benton, Niobrara and Ft. Pierre 



Cretaceous. By W. N. Logan 431 



Introduction 433 



Fort Benton Fauna 441 



Niobrara Fauna 480 



Fort Pierre Fauna 502 



Explanation of Plates 515 



Plates lxxxvi to cxx 519-583 



General Index 587 



