264 



HISTORICAL GEOLOGY 



Fig. 164 

 A group of Ichthyosaurs, Ichthyosaurus quadricissus, of the Enaliosaur division 

 of Mesozoic Reptiles. Maximum length 25 to 30 feet. Restoration by 

 C. R. Knight, under the direction of H. F. Osborn. (By permission of the 

 American Museum of Natural History.) 



