238 



S. W. WILLISTON. 



Cretaceous, inclines me to the belief that it will eventually be found 

 to be Triassic. Enlarged photographs are given of some of the 

 best of these numerous prints. The reverse of those at a and b 

 are shown in a^ and /;>'. In the lower, left corner is shown the 

 figure of a much larger print. It will be observed that the prints 

 occur in pairs, one with clear evidence of five, the other with but 

 four toes, from which the conclusion is justified that the crea- 



■^.uf^iVt' r ■» 



Fig. 4. Footprints from the red beds of Texas, near Abilene, enlarged about 

 one third. 



tures were tetradactyl in front, pentadactyl behind, as were the 

 Branchiosauria and as are the Urodela of to-day. Whether or 

 not they were real salamanders which made the prints, orbranchi- 

 osaurs, cannot be determined, but I am inclined to believe, in the 

 light of the evidence presented by Lysorophus, that the origin of 



