200 DR. B. PETRONIEVICS ON THE LOWER JAWS OF THE 



and text-fig. 7), but it must have been relatively smaller than 

 in Gomphognat}j,u8 (comp. text- fig. 6). 



In Gornphognathus there is a bony connexion between the 

 articular bones and the dentary (whose thickness could not be 

 established, but w T hich probably is not a considerable one), this 

 bony connexion, forming the roof of the angular notch, being 

 well preserved and visible on the left side (comp. text-fig. 1). The 



Text-figure 3. 



Gornphognathus : right ramus of lower jaw, internal view. X h 

 Shaded part covered with matrix. 



ang. ; angular. 

 art. ; articular. 

 cr. ? ; coronoid. 

 dent. ; dentary. 



in. con. dent.; incipient condyle of dentary. 

 prart. ; preartioular. 

 sj>l. ; splenial. 



Text-figure 4. 



Gornphognathus : left ramus of lower jaw, external view. X i. 



ang. ; angular. 

 dent. ; dentary. 



in.con.dent. ; incipient condyle of dentary. 

 pr.ang. ; processus angularis. 

 sang. ; supra-angular. 



sutures between the articular bones are not to be traced in their 

 whole length in Gornphognathus (comp. text-figs. 3 and 4), while 

 they are clearly visible in Cynognathus (comp. text-figs. 5, 6, 



