TABLE XXI. 

 Pedigree of Vertebrates. (Cf. Plate XV.) 



Osseous fiah 

 Teleostei 



Ganoid fiah 

 Ganoidea 



8. fflammals 



Single-lunged 



Monopnenmone* 



Donble-lunged 

 Dipneumones 



7. Birds 



Aves 



6. Reptiles 

 Reptilio, 



Mud-fish 

 Protopteri 



Atuuiotci 



5. Batrac^tans 



Amphibia 



Primitive fishes Selachii 

 3. Fishes Pt'sces 

 DoitblE=n0striIlli 

 Amphirhina 



Dipneusta 



' Lampreys Hags 



Pctromyzontes Myxinoides 



J t L 



2. Round-mouths 



5tnglc=nostrtllcl( MonorMna. 

 Craniota 



1. Tube-hearted 

 Sea-squirts Leptocordia 



AscidicB 



Acrania 

 Frrtcfaratrs 

 Vertebrata 



Chordoiiia 



Worms 

 Femes 



