COLD-BLOODED VERTEBRATA 395 



on the roof of the skull between the parietal bones. The 

 same arrangement is seen in lizards, but less well developed. 

 We have hinted how various groups of reptiles foreshow 

 in various ways, on the one hand the birds, and on the other 

 the mammals. It may be added that, among the large 

 number of extinct reptiles, some are known in which these 

 affinities are stronger. On the other hand, Lizards and 

 Rhynchocephalia are the most newt-like of reptiles, as 

 newts are the most fish-like of Amphibia. 



