62 



MR. D. M. S. WATSON ON THE 



planted. The four incisors, though powerful, are not so dispro- 

 portionately large as they are in earlier Gorgonopsids. 



The palate of Arctognathus is very well-preserved, but its 

 anterior end and two strips along the maxilla? are concealed by 

 unremoved matrix and by the lower jaw. 



The basioccipital is broken off through the vagal foramen, 

 where it is thin and not very wide. The posterior part of the 



Text-fioure 19. 



FV 



Arctognathus curvimola (Owen). Type-skull. 



The palate, X f. Stippled area covered by matrix and the lower jaw. 

 Parts in dotted lines hypothetical. 



A A, direction of the section of "Lycosaurus tigrinus," text-fig. 20. 



St., stapes. 



basisphenoid forms a triangular area with raised lateral margins, 

 representing the tubera of earlier forms. Above the edges the 

 sides of the bone are flat and verticil, posteriorly they terminate 

 in the region of the fenestra? ovales, these openings being con- 

 cealed by the foot of the stapes. Anteriorly these vertical sides 

 of the basisphenoid approach together until they are only 



