35 
THE SKELETON. 
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. 
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In the adult cat the sutures are sometimes obliterated so 
that this bone appears as a caudal continuation of the pala- 
The two pterygoid bones or plates form the descend- 
ing walls, and, together with the median portion of the 
tine. 
