192 



HISTORICAL GEOLOGY 



Fig. 116 

 A Permian Reptile, Pareiasaurus serrideus. This creature reached a length of 

 over 8 feet. (After Broom, from Chamberlin and Salisbury's "Geology," 

 courtesy of Herny Holt and Company.) 



Fig. 117 



A Permian Reptile (Pelycosaurian), Xaosaurus dariger. (After Osborn. 



from Scott's "Geology," permission of The Macmillan Company.) 



