PLATE III. 



Fig. 



1 . Arsinoitherium zitteli, Beadnell ; three parts grown skull, left side and 



(1 a) anterior views: one-sixth nat. size. Fluvio-marine beds (Upper 



Eocene). ['^yps specimen, C. 8130.J 



2. Ditto ; younger skull, superior, (2 a) left lateral, and (2 b) anterior aspects : 



one-sixth nat. size. Fluvio-marine beds (Upper Eocene). [C. 7805.] 



Page 



nZ.c, alisphenoid canal. 

 a.o.f., antorbital foramen. 

 dm. 4, fourth milk-molar. 

 e.a.m., external auditory meatus. 

 ecco., exoccipital. 

 fji., frontal horn. 

 /»•., frontal. 

 >., jugal. 

 la., lachrymal. 

 n. 1-2, molars. 

 ms.ff., mesethmoid groove. 

 mx., maxilla. 

 na., nasal. 

 nar., external nares. 



n.h., nasal horn. 

 orb., orbit. 

 pa., parietal. 

 jicfl., postglenoid process. 



pi., palatine. 

 jjm. 1-3, premolars. 

 pmx., premaxilla. 

 p.p., paroccipital process. 



pit., pterygoid. 

 pty., post-tympanic process. 



so., supraoccipital. 



sq., squamosal. 



II., optic foramen. 



