CHAPTER III THE MUSCLES 90 CHAPTER IV THE NERVOUS SYSTEM 131 CHAPTER V THE DIGESTIVE SYSTEM 150 CHAPTER VI THE UROGENITAL SYSTEM 192 CHAPTER VII THE RESPIRATORY SYSTEM 197 CHAPTER VIII THE VASCULAR SYSTEM 201 CHAPTER IX THE DEVELOPMENT OF THE ALLIGATOR 226 BIBLIOGRAPHY 343 INDEX 349 ILLUSTRATIONS PAGE ALLIGATOR MISSISSIPPIENSIS. (In color.) _Frontispiece_ FIGURE A. SKULL OF BELODON 5 1. MAP SHOWING THE PRESENT DISTRIBUTION OF CROCODILIA 6 2. HEADS OF AMERICAN ALLIGATOR AND CROCODILE _Facing_ 7 3. ALLIGATOR JOE IN THE EVERGLADES _Facing_ 10 4. ALLIGATOR HUNTER IN THE OKEFINOKEE _Facing_ 10 5. NEST OF C. POROSUS _Facing_ 21 6. JACKSON SLOUGH _Facing_ 21 7. A TYPICAL ALLIGATOR HOLE _Facing_ 23 8. ALLIGATOR NEST, MADE CHIEFLY OF GRASS _Facing_ 25 9. ALLIGATOR NEST, MADE CHIEFLY OF FLAGS _Facing_ 27 10. TWO SPECIES OF CAIMAN: BROAD-NOSED CAIMAN, SPECTACLED CAIMAN _Facing_ 35 11. TWO AFRICAN CROCODILES: NILE CROCODILE, WEST AFRICAN CROCODILE _Facing_ 39 12. SALT WATER CROCODILE _Facing_ 41 13. SKULL OF GAVIAL, VENTRAL VIEW _Facing_ 43 14. SKULL OF GAVIAL, LATERAL VIEW _Facing_ 43 15. ALLIGATOR SKINS _Facing_ 46 16. ENTIRE SKELETON OF CROCODILE 50 17. FIRST FOUR CERVICAL VERTEBRÆ OF CROCODILE 52 18. THORACIC AND SACRAL VERTEBRÆ OF CROCODILE 55 19. DORSAL VIEW OF SKULL OF ALLIGATOR _Facing_ 60 20. VENTRAL VIEW OF SKULL OF ALLIGATOR _Facing_ 63 20A. LONGITUDINAL SECTION OF TOOTH OF CROCODILE _Facing_ 66 21. LATERAL VIEW OF SKULL OF ALLIGATOR 69 22. POSTERIOR VIEW OF SKULL OF ALLIGATOR _Facing_ 70 23. SAGITTAL SECTION OF THE SKULL OF ALLIGATOR 71