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TRANSACTIONS OF THE AMERICAN PHILOSOPHICAL SOCIETY 



checked if possible by experimental transplantation of parts, would possibly give clues to 

 this problem. 



In general, long bodies bear long skulls, short bodies have short skulls and wide bodies 

 have wide skulls. But there are exceptions which are equally significant. In the peculiar 



Fig. 301. A. Long jaw, long snout (Tytosurus). B. Short jaw, long snout (Aulorhynchus). C. Long jaw, short snout 

 {Lampanyclus). D- Short jaw, short snout {Coptlandellus) . 



