CLASSIFICATION OF THE THERIODONTJA. 



39 



added to the original pair, the gaps between tliem being also 

 apparently continued as sutures on to the palate. Thus the 

 posterior part of the bar separating the internal nares seems to 

 be built up of two pairs of bones, of which the outer terminates 

 not far in front of the posterior ends of the nares. It is probable 

 that the inner pair are prevomers and the outer the anterior ends 

 of the pterygoids, which hence form a part of the border of the 

 posterior nares. 



Text-fio-ure 3. 



PV? p T . 



Arctops willistoni Watson. Type-skull. 

 Palatal aspect. Xf. 

 Ec.Pt., ectopterygoid ; Pak.Oc, pavoccipital ; Pt., anterior end of pterygoid ; 

 P.V. ?, prevomer, posterior end of internarial bar. Parts in broken lines 

 restored without evidence. 



Gorgonops torvus Owen, Cat. S. Afr. Kept. 1876. 



Type: a skull with the zygomatic arches broken away, the 

 basis cranii only represented by a fractured surface passing 

 horizontally through the basisphenoid. The paroccipital pro- 

 cesses only represented by the impression on the matrix of the 

 anterior face of that of the right side, the posterior part of the 

 palate represented only by the impression of its dorsal surface. 



