284 



Dr. B. Petronievics on the 



with the forward process of nasals (or, perhaps, with part of 

 the ossified iuteriiasal septum) from above, so that the bone 



Fig. 1. 



pa.^' 





pmx. 



pr. pmx. 



Skiill of Tritylodon, upper view, f nat. size. ^— , probable sutures ; 

 -•-.-, possible suture (between /r. aud prfr.) ; , restored parts. 



pa., parietal; sq., squamosal : ju,, jugal; //•., fi'ontal ; prfr., prefrontal ; 

 Ic, lacrimal ; na., nasals ; wi.r., maxillary ; sm.v., septomaxillary ; 

 pnix., premaxillarv ; pr.pmx,, process of tbe premaxillaries ; 

 *.^, second upper incisor. 



vertically separating the two nares seems to be composed of 

 these two parts. Between the front part of premaxillariea 



