( 121 ) 



TABLE XXI. 



Pedigree of Vertebrates. (Cf. Plate XV.) 



8. fflammals 

 Mammalia 



Osseous fish 



Teleostei 



Ganoid fish 



Ganoides 



Single-lunged 

 Monopnenmones 



Double-lunged 

 Bipneumones 



7. Birds 

 Aves 



I 

 6. Reptiles 



Iteptilia 



Y 



Mud-fish 



Protopteri 



SfotmonsUnimals 



Amniota 



I 

 5. 35atrachtan« 

 Amphibia 



4. fHiM'sh 

 Dipneusta 



Primitive fishes Selachii 

 3. Fishes Pisces 

 Douiilr^nostrillclJ 

 Amphirhina 



Lampreys Hags 



Petromxjzontes Myxinoides 



2. Round-mouths 

 Cylostoma 



\_ 



Sea-squirts 

 Ascidice 



iSmglfsnostrtllrtJ Monorhina 

 Jokullcti^nimals Craniota 



1. Tube-hearted 



Leptocardia 



Sea-barrels 



Thaliacea 



iHantlctJ Animals 

 Tunicata 



BfaxlhUzs 



Acrania 

 Vertebrates 

 Vertebrata 



Cljortia^ntmals 

 Chordoma 



Worms 

 Vermes 



