PLATE IV. 
Fig. Page 
1. ArsinoitJiCJ'ium zHtcU, V>c^A\\e\\ mandible, upper and (1 a) left side views : 
one-fourth nat. size. Fluvio-inarine beds (Upper Eocene). [M. 8463.] -2 
'1. Arsmoitherium midrewsi, Lankester ; left maxilla, outer and (2 a) palatal 
views : one-fourth nat. size. Fluvio-marine beds (Upper Eocene). 
[Type specimen, M. 8461.] SO 
b. Ditto; mandible, upper and (3 a) left lateral views: one-fourth nat. size. 
Fluvio-marine beds (Upper Eocene). specimen, M. 8461.] 30 
(t., angle of mandible. 
(•., canine, 
rd., eond}'le. 
coronoid process. 
/. 1-3, incisors or their alveoli. 
'III. 1-3, molars. 
m.f., mental foramen. 
jiiii. 1-4, premolars. 
a., s\mi[)!iysi.s of mandible. 
