viii Illustrations 



PAGE 



PROFESSOR E. D. COPE .... . . . . 78 



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 . lOQ 



CAMP AND WAGON OF THE FOSSIL HUNTERS ON GRASSWOOD 

 CREEK, CONVERSE Co., WYOMING 109 



SKELETON OF THE PLESIOSAUR, Dolichorhynchus osborni. 

 (AfterWilliston.) 114 



FOSSIL LIMB BONES OF THE GlANT SEA TORTOISE, PrO- 



tostega gigas 115 



FOSSIL SHELL OF GIANT LAND TURTLE, Testudo orthopygid 122 

 THE SNAKE-NECKED ELASMOSAURUS, Elasmosaurus platy- 



urus. 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 platy- 



copis. (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 magni- 



cornis. (After Broili.) .240 



PROFESSOR HENRY FAIRFIELD OSBORN 241 



FACSIMILE OF LETTER FROM DR. KARL VON ZITTEL TO THE 



AUTHOR 246 



