SUBORDER C 



PERISSODACTYLA 



141 



Fig. 185. 



Atelodus pachygnathus Wagner sp. Lower Pliocene, Pikermi, Greece. Skull. 

 1/7. (After Gaudry.) c.oc, Occipital condyle; fr, frontal; jug, jugal ; m, 

 maxilla ; n, nasal ; oc, occipital crest ; p-gl, postglenoid process ; 2^o-'>'i 

 parietal ; tern, temporal fossa. 



times with an adjacent smaller incisor ; inferior incisor small, second incisor 

 triangular, long, horizontal. Cheek teeth brachyodont. Premolars often 

 molariform and superior premolars and molars with crista, antecrochet, and 

 crochet. Brachycephalous. Nasal bones standing out prominently, broad 

 anteriorly, with a 

 rough protuberance 

 for a horn ; often a 

 horn on the frontal 

 bone. The older 

 forms possessed in- 

 cisors that are lack- 

 ing in later forms ; 

 the latter with a 

 bony nasal septum. 

 Lower Miocene, C. 

 tagicus Roman. 

 Upper Miocene of 

 Europe, C. (R.) simor- 

 rensis and C. san- 

 saniensis Lartet; 

 Lower Pliocene, B. schleiermacheri Kaup, as well as the existing C. sumatre7isis 

 Linn., all with incisors. E. hundsheimensis Toula, from the older Pleistocene 

 of Lower Austria, probably belongs to Cenitorhinus,' in which genus also 

 a. etruscus Falconer, and E. mercki Jiiger, referred to Coelodonta, could best 

 be placed, notwithstanding the absence of incisors and the presence of a 

 ^ bony nasal septum, for they are doubtless connected 



genetically with C. sansaniensis, etc., while E. 



antiqiiitatis may be traced back to one of the 



^ Pliocene Asiatic species of 



Ehinoceros, probably E. 



2)latp'hinus Lyd. 



(k) Ehinoceros s.str. 



G-ray (Zalabis Cope). 



LO.4.3. „^ , 



• Cheek teeth 



mainly hypsodont. Nose 

 with but one horn. Oc- 

 ciput inclined forward. 

 Post-tympanic and post- 

 glenoid processes an- 

 chylosed. Now living in 

 southern Lidia (E. sondaicus 



Horsf.). Fossil in the Siwalik beds, E. palaei'iidicus and sivalensis Falconer; 



Pleistocene of India and Borneo. 



(/) Atelodus Pomel (Diceros Gray) (Fig. 185). ' ' ' ' • Nose with two 



U. u. o. o, 



horns. Occiput inclined backward ; external auditory meatus open below. 

 Premolars molariform. Now living in Africa, E. bicornis, Linn. Fossil in 

 the Lower Pliocene, E. pachygnathus A. Wagner ; Upper Pliocene, A. 

 morgani Mecquenem, E. megarhinus Christol ; and oldest Pleistocene of 



Fig. 186. 

 Coelodonta antiquitatis Blumenb. sp. Pleistocene, Kent's Cavern, 

 Torquay. A, Upper molar. 2/3. B, Lower molar, inner view. 1/2. 

 (After Owen.) 



