PLATE XXV. 



Fig. Page 



1. Stereogenys cromeri, Andrews ; imperfect skull, from side : nat. size. Qasr-el- 



Sagha beds (Middle Eocene). [E. 3189.J 295 



2. Ditto ; skull, palatal view : nat. size. Same horizon. 



[Type specimen, C. 10027.] 295 



3. Ditto ; mandible, from above and (3 a) from side ; associated with type skull : 



nat. size. Same horizon. [Type specimen, C. 10027.] 298 



4. Thalassochelys libyca, Andrews ; posterior portion of skull, from behind : 



two-thirds nat. size. Same horizon. [Type specimen, C. 10029.J 287 



anig., angular process of mandible. 

 art., articular surface of mandible. 

 hoc, basioccipital. 

 cor., coronoid process of mandible. 

 ec.pt., ectopterygoid process of pter3goid. 

 e.n., external nares. 

 ep.o., epiotic. 

 exo., exoccipital. 



/., frontal. 

 f.c.i., internal carotid foramen. 

 /.«., foramen sphenoidale. 



g., groove leading to inner side of orbit. 

 i.n., internal nares. 



m.g., groove on side of mandible for muscle- 

 attachment. 



mx., maiilla. 



0.0. , opisthotic. 

 or., orbit. 



pa., parietal. 



pi., palatine. 

 pmx., premaxilla. 

 po.f., postfrontal. 

 pr.f., prefrontal. 



pt., pterygoid. 

 q., quadrate. 



soc, supraoccipital. 



sg'., squamosal. 

 sym., symphysis of mandible. 



t.o., tympanic opening. 



