ILLUSTRATIONS 



PAGE 



CHARLES H. STERNBERG .... Frontispiece 

 ROCKS OF LARAMIE BEDS ON SOUTH SCHNEIDER CREEK, 



CONVERSE Co., WYOMING 16 



WEATHERED ROCKS AND LARAMIE BEDS NEAR SOUTH 



SCHNEIDER CREEK 16 



MUSHROOM-LIKE CONCRETION KNOWN AS PULPIT ROCK . 17 

 FOSSIL LEAVES OF Sassafras dissectum. (After Les- 



quereux.) 20 



FOSSIL LEAVES, a, UNOPENED LEAF NODULE, b, NODULE 



OPENED TO SHOW FOSSIL LEAF. C, d, e, f, VARIOUS FORMS 



OF FOSSIL LEAVES 21 



FACSIMILE OF LETTER FROM DR. LESQUEREUX TO THE 



AUTHOR 24 



SKULL AND FRONT LIMB OF Clidastes tortor ... 44 



SKELETON OF Clidastes tortor . 45 



SKELETON OF RAM-NOSED TYLOSAUR, Tylosaurus dyspelor 45 

 RAM-NOSED TYLOSAUR, Tylosaurus dyspelor. Restoration 



by Osborn and Knight 50 



SKULL OF THE FLAT-WRISTED MOSASAUR, Platecarpus 



coryphaus 51 



RESTORATION OF KANSAS CRETACEOUS ANIMALS. (From 

 drawing by S. Prentice, after Williston.) a, Unita- 

 crinus socialis; b, Clidastes velox; c, Ornithostoma 



ingens 56 



GIANT CRETACEOUS FISH, Portheus molossus (above), 



COMPARED WITH A SIX-FOOT MODERN TARPON (below) . 57 



LOWER JAW OF Trachodon marginatus, SHOWING SUC- 

 CESSIVE LAYERS OF TEETH. TOP AND SIDE VIEWS OF A 



TOOTH OF Myledaphus bipartitus. (After Osborn and 



Lambe.) 76 



SKULL OF A DUCK-BILLED DINOSAUR, Diclonius, FOUR FEET 



IN LENGTH w .... , : N M >} w 77 



vii 



