CLASSES AND SUB-KINGDOMS. 



187 



Cetjbtaceans. 



Sub-Kingdom Veetebeata, with the following classes, 

 which were only briefly alluded to : Fishes, Amphibians, 

 Reptiles, Birds, Mammals. According to a late classifica- 

 tion of Professor Huxley's, these classes would stand lohthy- 

 opsida, which includes the Fishes and Amphibians ; Sou- 



