SKULL AND FRONT LIMB OF _Clidastes tortor_ 44
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 coryphæus_ 51
RESTORATION OF KANSAS CRETACEOUS ANIMALS. (From drawing by S. Prentice, after Williston.) _a_, _Unitacrinus 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 SUCCESSIVE 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 77
BRONTOSAURUS OR THUNDER LIZARD. Restoration by Osborn and Knight 79
FOSSIL SHELLS, _Haploscapha grandis_. (After Cope.) 108
CHARLES STERNBERG AND SON TAKING UP A LARGE SLAB OF FOSSILS FROM A CHALK BED IN GOVE CO., KANSAS 109
CAMP AND WAGON OF THE FOSSIL HUNTERS ON GRASSWOOD CREEK, CONVERSE CO., WYOMING 109
SKELETON OF THE PLESIOSAUR, _Dolichorhynchus osborni_. (After Williston.) 114
FOSSIL LIMB BONES OF THE GIANT SEA TORTOISE, _Protostega gigas_ 115
FOSSIL SHELL OF GIANT LAND TURTLE, _Testudo orthopygia_ 122
THE SNAKE-NECKED ELASMOSAURUS, _Elasmosaurus platyurus_. Restoration by Osborn and Knight 123
THREE-TOED HORSE, _Hypohippus_. (After Gidley.) 132
FOSSIL RHINOCEROS, _Teleoceras fossiger_. (After Osborn.) 133
SKULL AND TUSKS OF IMPERIAL MAMMOTH, _Elephas imperator_ 178
FOSSIL-BEARING CLIFFS. (After Merriam.) UPPER JOHN DAY EXPOSURE 179
FOSSIL-BEARING CLIFFS. (After Merriam.) MIDDLE JOHN DAY EXPOSURE 179
FOSSIL-BEARING CLIFFS. (After Merriam.) MASCALL FORMATION 202
FOSSIL-BEARING CLIFFS. (After Merriam.) CLARNO FORMATION 202
SKULL OF GREAT SABER-TOOTHED TIGER, _Pogonodon platycopis_. (After Cope.) 203
SKELETON OF FIN-BACKED LIZARD, _Naosaurus claviger_ 234
FIN-BACKED LIZARD, _Naosaurus claviger_. Restoration by Osborn and Knight 235
FACSIMILE OF LETTER FROM PROF. E. D. COPE TO THE AUTHOR 238
FOSSIL SKULL OF GIANT SALAMANDER, _Diplocaulus magnicornis_. (After Broili.) 240
FACSIMILE OF LETTER FROM DR. KARL VON ZITTEL TO THE AUTHOR 246
NIOBRARA GROUP, CRETACEOUS CHALK WITH CAP ROCK OF LOUP FORK TERTIARY, KNOWN AS CASTLE ROCK, GOVE CO., KANSAS 262