THE TRIAS. 



bony sheath ; also a hinder toe directed backwards, in which 

 feature we also see an assimilation to the next higher vertebrate 



FIG. 37. 



Skull of Rhynchosaurus. 



class. Footmarks, impressed in the way which has been de- 

 scribed, and attributed to this animal, confirm the appearances 

 presented by the extraordinary arrangement of its locomotive 

 organs. 



In the same beds occur a few bones, and a great number of 

 footsteps, which Professor Owen has fixed as the double memo- 

 rials of a group of animals, to which he has given (from the 



FIG. 38. 



Skull of Ldbyrmthodon. 



FIG. 39. 



Portion of transverse section of Tooth of 

 Labyrinthodon Jaegeri. 



