ORDER UNGULATA. 



1329 



Paris gypsum, the columns of the cheek-teeth are comparatively 

 tall, but in other species, like A. cayluxense of the Quercy Phos- 

 phorites (fig. 1204), they are shorter, and the teeth thus approxi- 

 mate to those of the brachydont species of Hyopotamus. This 

 genus is confined to Europe, and is characteristic of the Upper 

 Eocene (Lower Oligocene) and the Miocene of Ronzon in Puy-en- 



Fig. 1203. — Skeleton of Anoplotherium commune ; Upper Eocene, Europe. Much reduced 



Velay. The species from the South American Tertiaries originally 

 referred to this genus is now known as Proterotheriiim, and is 

 noticed under the Perissodactyla. The largest species was about 

 the size of a Tapir. Here may be noticed five genera from the 

 Quercy Phosphorites, some of which appear, on the whole, to be 

 most nearly allied to Anoplotherium, although their teeth present 

 certain resemblances to those of the Perissodactyla, in which sub- 

 order the last of the group is placed by some writers. Of these 



Fig. 1204.— The last five right upper cheek-teeth of Anoplotherium cayluxense ; 

 from the Upper Eocene of France. 



genera Adeotherium is characterised by the extreme complexity of 

 the last upper premolar, which resembles the first true molar; 

 Metriotherium is only known by the mandible, in which the pre- 

 molars are simpler than in the type genus ; and the true molars 

 show some resemblance to those of Lophiomeryx ; Mixtotkerium, 

 which is described from the palate, and is probably identical with 



