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TABLE XX. 



Systematic Survey of the Phylogenetic Classification of 



Vertebrates. 



I. JSituIWcss (Acrania), or &ubc4jcartcu (Leptocardia) . 

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



1. SkltlMfSS 

 Acrania 



I. Tube-hearted 



Leptocardia 



1. Lancelets 



1. Amphioxida 





II. Animals fotth. skulls (Craniota) and with centralis fjrarts (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-classes. 



2. &tttfl[lc= 



^ostrillcu 

 Monorhina 



3. ^on= 

 amnionate 



Anamnia 



4. Emmons 

 Animals 



Anmiota 



IT. Round mouths 

 Cyclostoma 



III. Fishes 

 Pisces 



I 



IV. Mud-fishes 



\ Dipneusta 



V. Batrachians 



Avyihibia 



J 

 \ 



VI. Reptiles 

 Reptilia 



2. 



3. 



VII. Birds 

 Axes 



VIII. Mammals 



Mammalia' 



Hags, or 



Mucous Fish 

 Lampreys 



Primitive Fish 

 Ganoid Fish 

 Osseous Fish 



Single-lunged 

 Double-lunged 



Mailed Batra- 

 chians 



Naked Batra- 

 chians 



Lizards 

 Snakes 

 Crocodiles 

 Tortoises 

 Sea-dragons 

 Dragons 

 Flying Reptiles 

 Beaked Animals 



Long-tailed 



Fan-tailed 



Bush-tailed 



Cloacal Animals 

 Pouched Ani- 

 mals 

 Placental Ani- 

 mals 



2. Hyperotreta 

 (Myxinoida) 



3. Hyperoartia 

 (Petromyzontia) 



4. Selachii 



5. Ganoides 



6. Teleostei 



7.Monopneumones 



8. Dipneumones 



9. Phractamphibia 



10. Lissamphibia 



11. Lacertilia 



12. Ophidia 



13. Crocodilia 



14. Chelonia 



15. Halisauria 



16. Dinosauria 



17. Pterosauria 



18. Anomodonta 



19. Saururas 



20. Carinataa 



21. Ratita? 



22. Monotrema 



23. Marsupialia 



24. Placentalia 



