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TABLE XXI. 

 Pedigree of Yertehrates. {Gf. Plate XF.) 



Osseous fish. 

 Teleostei 



Ganoid iish 

 Garwides 



Single-lnnged 

 Monopnennwnes 



Double-langed 

 Dipneumones 



7. Birds 

 Aves 



1 

 6. Reptiles 

 Septilia 



8. fftainmals 

 Mammalia 



Mud-fish 

 Frotopteri 



SmntDTt^animijIs 

 Amniota 



5. ISati-acIjians 

 Amphibia 



4. iHEuU^fisij 

 Dipneusta 



I 



— Lampreys Hags 



Primitive fishes Selachii Petromyzontes Myxinoides 



3. Fishes Pisces \ \ 



JBDuhlt^nostrilleli 

 Amphiihina 



2. Eound-moufclis 

 Cylostomci 



Sea-barrels 

 Thaliacea 



laantltH animals 

 Iimicata 



Singlesfiosttilltl) Monorhina 

 SfeuKeSsanimals Craniota 



1. Tube-hearted 

 Sea-squirts Leptocardia 



AscidicB 1 



Sltullslesa 



Acrania 



Utrtriitates 



Vertebrata 



ffifjotHa^'animals 

 Chordoma 



Worms 

 Vermes 



