140 



UNGULATA 



ORDER VII 



Each nasal bone usually furnished with a protuberance for the small horns, 

 which are placed side by side. Nearly all premolars molariform. Oligocene ; 

 Bohnerz, Europe ; D. zitteli Schlosser. Lower Miocene ; D. croizeti Pomel. 

 Middle Miocene ; D. douvillei Osborn. Upper Miocene ; 

 D. steinheimense Jiiger. One species, also, in the 

 Lower Pliocene. North American Oligocene ; D. 



Teleoceras fossiger Cope. Lower 

 Aphelo'iis nufjalodus Cope. Lower Pliocene (Loup Fork beds), Colorado. Pliocene, Kansas. Skull from 

 Skull from below, i/e- (After Cope.) below. Vio- (After Marsh.) 



proavitum Hatcher. Lower Miocene ; John Day beds, D. armatum and nanwn 

 Marsh. Lower Harrison beds, Nebraska, D. cooki and niobrarense Peterson. 



(g) Brachypotherium Eoger. ' ' ' ' • Brachy- 



X . U. O. O. 



cephalous. Premolars more simple than molars ; 

 all superior cheek teeth very simple, brachyodont 

 with antecrochet only ; short diastema in lower 

 jaw. Skull without horn. Extremities short and 

 robust. Middle Miocene ; Europe. B. aurelianense 

 Noulet. Upper Miocene, B. brachypus Lartet. 

 Lower Pliocene, B. goldfussi Kaup. B. perimense 

 Lydekker from India. B. pugnator Matsumoto 

 from Japan. 



{h) Teleoceras Hatcher (Fig. 183) and Aphelops 

 Cope (Fig. 182). The first Avith a small horn at 

 Ceratorhinus schieiermacheri Kaup the top of the uasals, the latter homless. Dental 



sp. Lower Pliocene, Eppelsheim. 10^ *? 



formula : ,W '„ „' • Crowns of teeth high ; 



Upper molar, ^/s. 



1.0.2-3.3. 



superior molars with well-developed crochet and antecrochet. Brachy- 



cephalous. Extremities short and robust. Habit more like Hippopotamus 



than Rhinoceros. Upper Miocene and Lower Pliocene, North America, A. 



megalodus Cope. Lower Pliocene, T. fossiger Cope. 



(i) Ceratorhinus Gray (Dihoplus Brandt) (Fig, 184). Dental formula : 



2-0.0.4.3. ^^ . . 



--~-r— — - Upper inner incisor low, with vertically compressed crown, some- 



