THE SKELETON. 



35 



The pterygoid portion of the sphenoid is a paired bone 

 (Figs. 17 and 18) lying on either side of the cranial half 

 of the basisphenoid and the caudal half of the presphenoid. 



In the adult cat the sutures are sometimes obliterated so 

 that this bone appears as a caudal continuation of the pala- 

 tine. The two pterygoid bones or plates form the descend- 

 ing walls, and, together with the median portion of the 



