20 



THE GEOLOGICAL EVIDENCES 



of the Labyrinthodontia. Now it is a surprising cir- 

 cumstance that many of the most ancient fishes, or 

 those which preceded the labyrinthodonts in time, 



Labyrinthodon Rutimeyeri, an early amphibian. 



have this same peculiarity of structure, and at the 

 present day we have still a form, the alligator-gar 

 one of the last remaining survivors of that ancient 



