The Biology of the Crocodilia 5 



odilia may well form an aquatic, further developed 

 branch" {Cambridge Natural History, p. 432). 



Prf--: 



Skull of Belodon. A, from above; B, from below. A, orbit; Bo, 

 basi-occipital; C/j, internal nares; Z), pre-orbital fossa; £a:o. exocci- 

 pital; Fr. frontal; Ju. jugal; La. lacrymal; Mx. maxilla; Na. nasal; 

 Pa. parietal; PI. palatine; Pmx. pre-maxilla; Por. post-orbital; Prf. 

 pre-frontal; P/. pterygoid; Qm. quadrate; 5, lateral temporal fossa; 

 S', superior temporal fossa; Sq. squamosal; Vo. vomer. (From Zittel.) 



Fig, a. a Triassic Ancestor of the Crocodilia. 



From Parker & Has well, Textbook of Zoology. 



The direct ancestors of the Crocodilia, Gadow 

 says, are still unknown. 



