OF EVOLUTION. 



relationship. The amphibians not only approach 

 the fishes, but the fishes approach equally the 

 amphibians. There exist a limited number of 



1. Ceratodus Forsteri, mud-fish of Australia. 2. Dental armature 

 of same. 



fishes, known as " mud-fishes," inhabitants of the 

 waters of South America, Africa, and Australia, 

 which depart from other fishes so widely as to be 



