The Biology of the Crococlilia 5 



odilia may well form an aquatic, further developed 

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



Pmx 



Prf- 



Skull of Belodon. A, from above; B, from below. .4, orbit; Bo, 

 basi-occipital; Ch, internal nares; D, pre-orbital fossa; Exo. exocci- 

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

 Pa. parietal; PL palatine; Pmx. pre-maxilla; For. post-orbital; Prf. 

 pre-frontal; Pi. pterygoid; Qu. quadrate; S, lateral temporal fossa; 

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



FIG. A. A TRIASSIC ANCESTOR OF THE CROCODILIA. 



From Parker & Haswell, Textbook of Zoology. 



The direct ancestors of the Crocodilia, Gadow 

 says, are still unknown. 



