446 PROF. W. J. SOLLAS ON A NEW SPECIES OF PLESIOSATTRUS 



area, the transverse section of a bone which is continued backwards 

 on the side of the skull to terminate on the inner side of the lower 

 end of the quadrate. In all probability this bone is the pterygoid, or 



Tig. 1. — Transverse Section through the Skull in the Region of the 

 Supratemjooral Fossce. (Scale J.) 



at all events a part of it ; and the narrow neck from which it extends 

 may be partially furnished by the basipterygoid process ; but there is 

 no evidence of the existence of a joint between it and the pterygoid. 

 The lower process of the bifurcation may also be a part of the ptery- 

 goid ; if not, I do not know what nature to suggest for it. 



On the left side the pterygoid is crushed up against the basisphe- 

 noid, almost obliterating the space which separates them on the 

 right; and the descending process below it is thrust and broken 

 against the lower jaw. 



