362 THE AMERICAN NATURALIST [Vol. XLII 



of these quadrupeds known in rocks of Devonian or of 

 Mississippian age, although Lohest (1) some years ago 

 called attention to some remains which he thought were 

 amphibian from the Devonian rocks of France. Thevenin 

 has recently cast doubt upon this interpretation by 

 Lohest (2) and the figures as given by Lohest would seem 

 not to be amphibian, but fish remains. 



In rocks of the lower part of the Pennsylvanian occur, 

 in North America, the first evidences of the bones of 

 quadrupeds. The Amphibia show, even thus early, that 

 their line had divided into three and possibly four dis- 

 tinct groups which are usually known as the Branchio- 



