LIST OF FIGURES IN TEXT. 



PAET I. 



FiGUEE. Page. 



1. Skull of Diplodocus longus Marsh . 5 



2. Dentary Bone of Diplodocus longus 8 



3. Section of Maxillary Bone of Diplodocus longus 9 



4. Atlas of Diplodocus longus, Side View 19 



5. Atlas of Diplodocus longus, Front View 19 



6. Axis of Diplodocus carnegii, Seen from Right Side 20 



7. Tenth, Eleventh, and Twelfth Cervicals of Diplodocus carnegii, Seen from Right Side. . 22 



8. Posterior View of Eleventh Cervical of Diplodocus carnegii 23 



9. Inferior View of Sacrum and Ilia of Diplodocus carnegii ... 30 



10. Sacrum and Ilium of Diplodocus longus Marsh, Seen from Below 38 



11. Coossified Caudal Vertebrae of Diplodocus carnegii 36 



12. Superior View of Pair of Sternal Bones of Diplodocus carnegii '. . . 40 



13. Supposed Clavicle of Diplodocus carnegii 41 



14. External View of Right Scapula and Coracoid of Diplodocus carnegii 44 



15. Proximal End of Left Femur of Diplodocus carnegii 46 



16. Distal End of Left Femur of Diplodocus carnegii 46 



17. Oblique Internal Front View of Left Femur of Diplodocus carnegii 47 



18. Proximal End of Right Tibia and Fibula of Diplodocus carnegii 48 



19. Distal End of Right Tibia and Fibula of Diplodocus carnegii 48 



20. Superior View of Astragalus of Right Pes of Diplodocus carnegii 50 



21. Front View of Right Hind Foot of Diplodocus carnegii 51 



22. Front View of Right Hind Foot of JBrontosaurus excelsus Marsh 52 



23. Cross-sections of Left Femur of Diplodocus carnegii 53 



24. Cervical Vertebra of Diplodocus longus Marsh 56 



PART 11. 



1. Skull of Daphcenus felinus Scott '0 



2. Inferior View of Basicranial Region of Skull of Canis familiaris 73 



3. Inferior View of Basicranial Region of Skull of Daphosnus felinus 74 



4. Crown View of Right Superior Sectorials of Prodaphcenus scottii, Daphcenus felinus, and 



Canis lagopus ' ' 



5. Crown View of Right M..^ of Daphoinus felinus 78 



6. Side View of Type of Proamphicyon nebrascensis Hatcher 96 



7. Crown View of Superior Dentition of Type of Proamphicyon nebrascensis Hatcher 98 



vii 



