OF EVOLUTION. 21 



ichthyic group, the ganoids which retains this 

 peculiarity of dental structure. From what has 

 already been said, I believe it will be admitted that 

 we have the strongest kind of evidence to show 

 that the amphibians have been developed from the 

 fishes, and further, that one of the most striking 



Section of labyrinthodont tooth. 



characters of these most ancient amphibians is 

 a character which had already been developed in 

 that class of animals whose position is unmistak- 

 ably below them in the scale of organization. 



Passing now to a consideration of what some 

 choose to call the rather anomalous appearance of 



