xii LIST OF ILLUSTRATIONS 



Fig. Page 



8. The Track of a Three-toed Dinosaur . 47 



9. A Great Sea Lizard, Tylosaurus Dyspelor . 52 

 From a drawing by J. M. Oleeson. 



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 . 70 

 From the specimen in the Berlin Museum. 



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 . 82 

 From a drawing by J. M. Oleeson. 



17. Archaeopteryx . . ... 89 

 As Restored by Mr. Pycraft. 



18. Thespesius, a Common Herbivorous Dinosaur 



of the Cretaceous . . . .90 

 From a drawing by Charles R. Knight. 



19. A Hind Leg of the Great Brontosaurus, the 



Largest of the Dinosaurs . . .96 



