Introduction. 



xxvii 



Tabular View of the System of Classification adopted in this 

 work, giving" the various Classes into which the seven Sub- 

 kingdoms are divided. The relative positions of the names of 

 the Classes indicate the relations of afiinity and of rank which 

 each Class has been supposed to hold to the other Classes 

 in its own Sub-kingdom. 



Mammalia 



Aves 

 Eeptilia 



VERTEBRATA 



Amphibia 

 Pisces 



Arachnida Myriopoda 



AETHROPODA 



Crustacea 



Insecta 



Cephalopoda pteropoda 



Gasteropoda 

 MOLLUSCA Laraellibranchiata 

 Tunicata 

 Brachiopoda 

 Polyzoa 



Ctenophorae 



COELENTERATA 



Anthozoa 



Hydrozoa 



Holothiirioidea Echinoidea 

 ECHINODBRMATA 



Crinoidea Asteroidea 



Annulata Gephyrea 



VERMES Rotifera 



Nematelminthes 

 Platyelminthes 



Spongiadae Infusoria 

 PROTOZOA 

 Rhizopoda Gregariuae 



