| Phororhacos, a Patagonian Giant of the Miocene
From a Drawing by Charles R. Knight | Frontispiece |
| Fig. | | Page |
| 1. | Diplomystus, an Ancient Member of the Shad Family
From the fish-bed at Green River, Wyoming. From a specimen in the United States National Museum. | 4 |
| 2. | Bryozoa, from the Shore of the Devonian Sea that Covered Eastern New York
From a specimen in Yale University Museum, prepared by Dr. Beecher. | 10 |
| 3. | Skeleton of a Radiolarian Very Greatly Enlarged | 17 |
| 4. | Cephalaspis and Loricaria, an Ancient and a Modern Armored Fish | 24 |
| 5. | Pterichthys, the Wing Fish | 32 |
| 6. | Where a Dinosaur Sat Down | 38 |
| 7. | Footprints of Dinosaurs on the Brownstone of the Connecticut Valley
From a slab in the museum of Amherst College. | 40 |
| 8. | The Track of a Three-toed Dinosaur | 47 |
| 9. | A Great Sea Lizard,
Tylosaurus Dyspelor From a drawing by J. M. Gleeson. | 52 |
| 10. | Jaw of a Mosasaur, Showing the Joint that Increased the Swallowing Capacity of that Reptile | 54 |
| 11. | Koch's Hydrarchus. Composed of Portions of the Skeletons of Several Zeuglodons | 62 |
| 12. | A Tooth of Zeuglodon, One of the "Yoke Teeth," from which it derives the name | 69 |
| 13. | ArchÆopteryx, the Earliest Known Bird
From the specimen in the Berlin Museum. | 70 |
| 14. | Nature's Four Methods of Making a Wing: Bat, Pteryodactyl, ArchÆopteryx, and Modern Bird | 72 |
| 15. | Young Hoactzins | 75 |
| 16. | Hesperornis, the Great Toothed Diver
From a drawing by J. M. Gleeson. | 82 |
| 17. | ArchÆopteryx
As Restored by Mr. Pycraft. | 89 |
| 18. | Thespesius, a Common Herbivorous Dinosaur of the Cretaceous
From a drawing by Charles R. Knight. | 90 |
| 19. | A Hind Leg of the Great Brontosaurus, the Largest of the Dinosaurs | 96 |
| 20. | A Single Vertebra of Brontosaurus | 97 |
| 21. | Moloch, a Modern Lizard that Surpasses the Stegosaurs in all but Size
From a drawing by J. M. Gleeson. | 100 |
| 22. | Skeleton of Triceratops | 103 |
| 23. | The Horned Ceratosaurus, a Carnivorous Dinosaur
From a drawing by J. M. Gleeson. | 106 |
| 24. | Stegosaurus, an Armored Dinosaur of the Jurassic
From a drawing by Charles R. Knight. | 108 |
| 25. | Skull of Ceratosaurus
From a specimen in the United States National Museum. | 110 |
| 26. | Triceratops, He of the Three-horned Face
From a statuette by Charles R. Knight. | 126 |
| 27. | A Hint of Buried Treasures | 137 |
| 28. | Relics of the Moa | 140 |
| 29. | Eggs of Feathered Giants, Æpyornis, Ostrich, Moa, Compared with a Hen's Egg | 148 |
| 30. | Skull of Phororhacos Compared with that of the Race-horse Lexington | 151 |
| 31. | Leg of a Horse Compared with that of the Giant Moa | 152 |
| 32. | The Three Giants, Phororhacos, Moa, Ostrich | 158 |
| 33. | Skeleton of the Modern Horse and of His Eocene Ancestor |
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