200 



DR. B. PETRONIEVICS ON THE LOWER JAWS OF THE 



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

 in Gomphogyiathus (comp. text-fig. 6). 



In Gomphoynathus there is a bony connexion between the 

 articular bones and the dentary (whose thickness could not be 

 established, but which probably is not a coDsiderable one), this 

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

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



Text-figure 3, 



m. con. 



Gom/pliognathus : right ramus of lower jaw, internal view. X J. 

 Shaded part covered with matrix. 



ang. ; angular. 



art. ; articular. 



cr. ? ; coronoid. 



dent. ; dentary. 



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



jirart. ; prearticular. 



spl. ; splenial. 



Text-figfure 4. 



in.condent 



ang. 



jjr.ang. 



Gompkoffnatlnts : left ramus of lower jaw, external view. X j. 



ang. ; angular. 



dent. ; denrary. 



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 Go^njyhoguathits (comp. text-figs. 3 and 4;, while 

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



