( 121 ) 



TABLE XXL 



Pedigree of Vertebrates. {Cf. Plate XV.) 



Osseous fish 

 Teleostei 



Ganoid fish 

 Gaiwides 



Single-lunged 

 Monopnenmones 



Double-lunged 

 Dipneumones 



7. Birds 

 Aves 



I 

 6. Reptiles 



Eepti'ia 



8. fflammals 

 Mammalia 



Mud-fish 

 Frotopteri 



Slmuion^^ntmals 

 Amniota 



I 

 5. Batrncl)ians 

 Amphibia 



4. fHii^.fisfj 

 Dipneusta 



Primitive fishes Selaehii 

 3. Fishes Pisces 

 Doiiblc^nostrillcU 

 Amphirhina 



Lampreys Hags 



Petroviyzontes Myxinoides 



2. Round-mouths 

 Cylostoma 



Sea-squirts 

 AscidioB 



Sea-barrels 



Thaliacea 



i^antlcti Animals 

 Tunicata 



^inglc-nostvillcti Monorhina 

 .Skullell^Snimals Craniota 



1. Tube-hearted 

 Leptocardia 



Acrania 



Fertcbratcs 

 Vertebra ta 



Chordoma 



Worms 

 Vermes 



