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| Charles H. Sternberg | [Frontispiece] |
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| Rocks of Laramie Beds on South Schneider Creek, Converse Co., Wyoming | [16] |
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| Weathered Rocks and Laramie Beds near South Schneider Creek | [16] |
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| Mushroom-like Concretion Known as Pulpit Rock | [17] |
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| Fossil Leaves of Sassafras dissectum. (After Lesquereux.) | [20] |
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| Fossil Leaves. a, Unopened Leaf Nodule. b, Nodule opened to show fossil leaf. c, d, e, f, Various forms of fossil leaves | [21] |
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| Facsimile of letter from Dr. Lesquereux to the author | [24] |
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| Skull and Front Limb of Clidastes tortor | [44] |
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| Skeleton of Clidastes tortor | [45] |
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| Skeleton of Ram-nosed Tylosaur, Tylosaurus dyspelor | [45] |
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| Ram-nosed Tylosaur, Tylosaurus dyspelor. Restoration by Osborn and Knight | [50] |
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| Skull of the Flat-wristed Mosasaur, Platecarpus coryphæus | [51] |
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| Restoration of Kansas Cretaceous Animals. (From drawing by S. Prentice, after Williston.) a, Unitacrinus socialis; b, Clidastes velox; c, Ornithostoma ingens | [56] |
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| Giant Cretaceous Fish, Portheus molossus (above), compared with a six-foot modern Tarpon (below) | [57] |
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| 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] |
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| Skull of a Duck-billed Dinosaur, Diclonius, FOUR FEET IN LENGTH | [77] |
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| Professor E. D. Cope | [78] |
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| Brontosaurus or Thunder Lizard. Restoration by Osborn and Knight | [79] |
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| Fossil shells, Haploscapha grandis. (After Cope.) | [108] |
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| Charles Sternberg and son taking up a large slab of fossils from a chalk bed in Gove Co., Kansas | [109] |
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| Camp and Wagon of the fossil hunters on Grasswood Creek, Converse Co., Wyoming | [109] |
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| Skeleton of the Plesiosaur, Dolichorhynchus osborni. (After Williston.) | [114] |
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| Fossil limb bones of the Giant Sea Tortoise, Protostega gigas | [115] |
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| Fossil shell of Giant Land Turtle, Testudo orthopygia | [122] |
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| The Snake-necked Elasmosaurus, Elasmosaurus platyurus. Restoration by Osborn and Knight | [123] |
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| Three-toed Horse, Hypohippus. (After Gidley.) | [132] |
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| Fossil Rhinoceros, Teleoceras fossiger. (After Osborn.) | [133] |
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| Skull and tusks of Imperial Mammoth, Elephas imperator | [178] |
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| Fossil-bearing Cliffs. (After Merriam.) Upper John Day exposure | [179] |
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| Fossil-bearing Cliffs. (After Merriam.) Middle John Day exposure | [179] |
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| Fossil-bearing Cliffs. (After Merriam.) Mascall Formation | [202] |
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| Fossil-bearing Cliffs. (After Merriam.) Clarno Formation | [202] |
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| Skull of Great Saber-toothed Tiger, Pogonodon platycopis. (After Cope.) | [203] |
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| Skeleton of Fin-backed Lizard, Naosaurus claviger | [234] |
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| Fin-backed Lizard, Naosaurus claviger. Restoration by Osborn and Knight | [235] |
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| Facsimile of letter from Prof. E. D. Cope to the author | [238] |
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| Fossil skull of Giant Salamander, Diplocaulus magnicornis. (After Broili.) | [240] |
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| Professor Henry Fairfield Osborn | [241] |
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| Facsimile of letter from Dr. Karl von Zittel to the author | [246] |
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| Dr. Karl von Zittel | [256] |
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| Shell of Toxochelys bauri? | [257] |
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| Niobrara Group, Cretaceous chalk with cap rock of Loup Fork Tertiary, Known as Castle Rock, Gove Co., Kansas | [262] |
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| Chalk of Kansas, known as the Coffee Mill. Hell Creek | [262] |
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| Bones of Platecarpus coryphæus | [263] |
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| Skeleton of Hesperornis regalis, the Giant-toothed Bird of the Kansas Cretaceous | [266] |
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| Slab of Fossil Crinoids, Uintacrinus socialis, CONTAINING 160 CALYCES, COVERING FOUR BY SEVEN FEET | [267] |
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| Skull and Horns of Giant Bison from Hoxie, Kansas. Spread of horn cores six feet, one inch; length along curve, eight feet | [268] |
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| Jaw of Columbian Mammoth, Elephas columbi | [269] |
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| Three-horned Dinosaur, Triceratops sp. Restoration by Osborn and Knight | [270] |
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| Duck-billed Dinosaur, Trachodon mirabilis. Restoration by Osborn and Knight | [271] |