PLATE IX. 



Fig. Page 



1. Moeritherium lyonsi, Andrews ; skull of a young individual, right side view : 



one-half nat. size. Muvio-marine beds (Upper Eocene). [C. 7867.] 99 



2. Ditto ; right lower dentition, crown view : nat. size. Same horizon. 



[M. 8501.] 109 



3. Ditto ; right lower premolars, inner and (3 a) crown views : nat. size. Same 



horizon. [C. 8127.] 109 



4. Ditto ; right upper premolars, crown view : nat. size. Same horizon. 



[M. 8500.] 106 



5. Mceritheriiim trigonodon, Andrews ; right lower molars, crown view : nat. size. 



[Type specimen, M. 8499.J 128 



ae., antero-external cusp. 

 ai., antero-internal cusp. 

 a.o.f., antorbital foramen. 

 e.a.m., external auditory meatus. 

 exo., exoccipital. 

 fr., frontal. 



i. 2, second upper incisor. 

 ju., jugal. 

 m. 1-3, molars. 

 mx., maxilla. 

 na., nasal. 



nar., external nares. 

 orb., orbit. 

 j>a., parietal. 



pe., postero-external cusp. 

 pm. 2-4, premolars. 

 pm.v., premasilla. 

 p.p., paroccipital process. 

 ps., parastyle. 

 pty., post-tympanic process. 

 soe., supraoccipital. 

 sq., squamosal. 



