PLATE IV. 
]’ig. Page 
1. Arsinoitherium zitfeli, Beadnell ; mandible, upper and (1a) left side views : 
one-fourth nat. size. Fluvio-inarine beds (Upper Eocene). [M. 8463.] -2 
'1. Arsinoitherium andrewsi, Lankester ; left maxilla, outer and (2 a) palatal 
views ; one-fourth nat. size. Fluvio-marine beds (Upper Eocene). 
[Type specimen, M. 8461.] Sb 
o. Ditto; mandible, upper and (o a) left lateral views: one-fourth nat. size. 
Eluvio-marine beds (Upper Eocene). [I'ype specimen, M. 8461.] bb 
a., angle of mandible. 
(•., canine. 
cd., condyle. 
c.p., coronoid process. 
i. 1-13, incisors or their ah eoli. 
ja. 1-3, molars. 
ni.f., mental foramen. 
pm. 1-4, premolars. 
i-., symphysis of mandible, 
