{ III. Fish { 4. Primæval fish 4. Selachii { _Pisces_ { 5. Ganoid fish 5. Ganoides { { 6. Osseous fish 6. Teleostei { { IV. Mud-fish { 7. Mud-fish 7. Protopteri 3. =Non-amnionate= { _Dipneusta_ { { +Anamnionata+ { { 8. Primæval 8. Simosauria { V. Sea-dragons { dragons { _Halisauri_ { 9. Snake-dragons 9. Plesiosauria { { 10. Fish-dragons 10. Ichthyosauria { { VI. Batrachians { 11. Mailed Batrachians 11. Phractamphibia { _Amphibia_ { 12. Naked Batrachians 12. Lissamphibia 4. =Amnion= { VII. Reptiles { 13. Primary reptiles 13. Tocosauria =Animals= { _Reptilia_ { 14. Lizards 14. Lacertilia +Amnionata+ { { 15. Serpents 15. Ophidia { { 16. Crocodiles 16. Crocodilia { { 17. Tortoises 17. Chelonia { { 18. Flying reptiles 18. Pterosauria { { 19. Dragons 19. Dinosauria { { 20. Beaked reptiles 20. Anomodontia { { VIII. Birds { 21. Long-tailed 21. Saururæ { _Aves_ { 22. Fan-tailed 22. Carinatæ { { 23. Bush-tailed 23. Ratitæ { { IX. Mammals { 24. Cloacal animals 24. Monotrema { _Mammalia_ { 25. Pouched animals 25. Marsupialia { { 26. Placental animals 26. Placentalia ----------------------------------------------------------------