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. Archaeopteryx, the Earliest Known Bird _From the specimen in the Berlin Museum._ 70 14. Nature's Four Methods of Making a Wing: Bat, Pteryodactyl, Archaeopteryx, and Modern Bird 72 15. Young Hoactzins 75 16. Hesperornis, the Great Toothed Diver _From a drawing by J. M. Gleeson._ 82 17. Archaeopteryx _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, AEpyornis, Ostrich, Moa, Compared with a Hen's Egg 148