302 Mr. D. ^J. S. Wafsou on 



the supraoccipital inclines forwards ; it is a l)road flat plate 

 provided with a low median ridge, and its upper and onter 

 edges are covered by the interparietal and tabulares. The 

 post-temporal fossse are not well shown, but on the left side 

 tiie upper border is clear as a smooth notch on the lower 

 edge of the tabular, and something is seen of the parocci|)ital 

 process below it on the right side, wli.'re its end is in contact 

 Avith the squamosal. It is certain from the condition on 

 either side that the fossa was very small. 



Below the post-temporal fossa there is a considerable- 

 exp mse of bone visible on the left side, which is partly hasi- 

 occipital. The foramina in this region are not visible, but 

 the position of the inner ends of the stapes, which agrees on 

 the two sides, shows that the fenestra ovale lay very low 

 down just above the tubera basisphenoidalcs. 



Supratcmporal. 



As shown on the right side, the supratcmporal is a very 

 small bone having a suture with the parietal and wedged in 

 between the tabular and the squamosal. In front the suture 

 is perfectly clear, and was represented in Prof. IJroili's 

 original figure; behind, although not so clear, it is, I think, 

 fairly certain. It is unfortunate that the loss of this region 

 on the left side prevents corroboration there. 



Squamosal. 



The upper part of the squamosal is in contact with the 

 lower surface of the parietal, which terminates behind in a 

 suture with it. In fr(mt it touches the postorbital, so as 

 completely to exclude the parietal from the temporal fossa. 

 Further back it forms a plate on the side of the skull, curves 

 round on to the back, and then still further until it plunges 

 under the tabular and paroccipital ; below the post-temporal 

 fossa it is clearly shown on the left side to be overlapped by 

 the ])terygoid. 



On the right side what is either the lower end of the 

 squamosal or the striated surface to which it was attache<l 

 is seen on the outer and posterior side of the (juadrate some 

 distance above the articulation. 



Stapes. 



The proximal end of the stapes is in position on both 

 sides ; it is an extremely massive bone, consisting of a 

 laterally compressed shaft Mhicii expands considerably at the 

 fenestra ovale ; it cannot be seen if it is ])eri'urated for the 

 stapedial artery. 



