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TABLE XX. 



Systematic Survey of the Phylogenetic Classification of 

 Vertebrates. 



I. SfculWess (Acrania), or Kubt^ZKXtzti (Leptocardia). 

 Vertebrates without a specialized head, skull, brain, or centralized heart. 



l. &fai\hlzzs 

 Acrania 



I. Tube-hearted 

 Leptocardia 



1. Lancelets 



1. Amphioxida 



II. Animals fcritfj skulls (Craniota) and with central^ hearts (Pachycardia), 



Vertebrates with specialized head, with skull and brain, and with a 



centralized heart. 



Main-classes 



of the 



Skulled Animals. 



Classes 



of the 



Skulled Animals. 



Sub-classes 



of the 



Skulled Animals. 



Systematic Name 



of the 



Sub-classai. 



2. Single* 

 ^ostrilletJ 

 Monorhina 



3. Nott* 

 ammonatt 

 Anamnia 



4. Sfotmon* 

 Animals 

 Amniota 



II. Round mouths 

 Cyclostoma 



III. Fishes 

 Pisces 



IV. Mud-fishes 

 ( Dipneusta 



V. Batrachians 

 Amphibia 



VI. Reptiles 

 R&ptilia 



VII. Birds 



Aves 



VIII. Mammals 

 Mammalia 



2. Hags, or 



Mucous Fish 



3. Lampreys 



4. Primitive Fish 



5. Ganoid Fish 



6. Osseous Fish 



7. Single-lunged 



8. Double-lunged 



9. Mailed Batra- 



chians 

 10. Naked Batra- 

 chians 



jlL Lizards 



12. Snakes 



13. Crocodiles 



14. Tortoises 



15. Sea-dragons 



16. Dragons 



17. Flying Reptiles 

 v 18. BeakedAnimals 



19. Long-tailed 



20. Fan-tailed 



21. Bush-tailed 



22. CloacalAnimals 



23. Pouched Ani- 



mals 



24. Placental Ani- 



mals 



2. Hyperotreta 

 (Myxinoida) 



3. Hyperoartia 

 (Petromyzontia) 



4. Selachii 



5. Ganoides 



6. Teleostei 

 7.Monopneumonee 



8. Dipneumones 



9. Phractamphibiu 



10. Lissamphibia 



11. Lacertilia 



12. Ophidia 



13. Crocodilia 



14. Chelonia 



15. Halisauria 



16. Dinosauria 



17. Pterosauria 



18. Anomodonta 



19. Saururae 



20. Carinatae 



21. Ratitae 



22. Monotrema 



23. Marsupialia 



24. Placenttlia 



