TABLE XXI. 

 Pedigree of Vertebrates. (Cf. Plate XV.) 



Osseous fish 

 Telcostei 



Ganoid fish 

 Ganoides 



Single-lnnged 

 M onop nenmones 



Double-lunged 

 Dipneumones 



8. fflatnmals 

 Mammalia 



Mud -fish 

 Protopteri 



7. Birds 

 Aves 



6. Reptiles 

 Repti'ia 

 I 



Smrn'on^nitnals 

 Amniota 



I 



5. Batrarljtans 

 Amphibia 



Dipneusta 



Primitive fishes Selachii 

 8. Fishes Pisces 



Amphirhina 



1. Tube-hearted 



Sea-squirts Leptocardia 



Ascidice | 



Thalic 

 I 



Jflantlrti Sntmalu 

 Tunicata 



Acrania 



Fcrtcbratea 

 Vertebra ta 



Lampreys Hags 



Pctromygontes Myxinoides 



J _ L 



2. Eound-mouths 

 Cylostoma 



Monorhina 

 Craniota 



Cfjorta^nitnals 



Chordoiiia 



Worms 

 Vermes 



