PLATE IX. 
Pig. Page 
1. Mceritherium lyonsi^ Andrews; skull of a young individual, right side view : 
one-half nat. size. Fluvio-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.] 10(3 
5. Mceritherium trigonoclon, Andrews; right lower molars, crown view : nat. size. 
[Type specimen, M. 8499.] 128 
ae., autero-oxternal cusp. 
ai., autero-internal cusp. 
a.o.f., antorbital foramen. 
e.a.m., external auditory meatus. 
iwo., exoccipital. 
fr., frontal. 
i. 2, second upper incisor. 
./it., jugal. 
m. 1-3, molars. 
mx., maxilla. 
na., nasal. 
unr., external nares. 
orh., orbit. 
IM., parietal. 
pe., postero-external cusp. 
^n«.3-4, ])remolars. 
pmX; premaxilla, 
juj)., paroccipital process. 
])s., parastyle. 
pty., post-tympanic process. 
soc., supraoccipital. 
6vy., stpiamosal. 
