PLATE IV. 



Fig. Page 



1. Arsinoitlierium zitteli, Beadnell ; mandible, upper and (1 a) left side views : 



one-fourth nat. size, Fluvio-marine beds (Upper Eocene). [M. 8463.] 22 



2. Arsinoitlierium andrewsi, Lankester ; left maxilla, outer and (2 a) palatal 



views : one-fourth nat. size. Fluvio-marine beds (Upper Eocene). 



[Type specimen, M. 8461.J 80 



3. Ditto; mandible, upper and (3a) left lateral views: one-fourth nat. size. 



Fluvio-marine beds (Upper Eocene). [Type specimen, M. 8461.] 80 



a., angle of mandible. 

 c, canine. 

 cd., condyle. 

 C.J)., coronoid process. 

 1-3, incisors or their aheoli. 



m. 1-3, molars. 



m./., mental foramen. 

 jmi. 1-4, premolars. 



s., sjanphysis of mandible. 



