178 



UNGULATA 



ORDER VII 



\ 



.ifV 



p- 



II ( 



the rhinoceros (A. magnum Cuvier) and the pig {A. minus Cuvier, A. valdense 



Kowalevsky), In the Upper Oligocene (Protoceras beds) of Dakota similar 



forms also occur, named Heptacodon, Odacodon Marsh. 



Brachyodus Gervais. Dental series continuous. Upper molars quadrate. 



Oligocene of Europe, B. porcinus Gerv. Middle Miocene of Europe, B. onoideus 



Gerv. In Egypt, B. africanus Andrews. Also Lower Miocene of British East 



Africa and India. 



Ancodus Pomel (Hyopotamus Owen non Riitimeyer ; Bothriodon Aymard) 



(Fig. 242). Large-sized, the skull longer and lower than in Anthracotherkim. 



Canines weaker, and the first pre- 

 ^ ' molar separated from adjacent 



teeth by a wide interval. Cusps 

 of the molars above and below 

 distinctly V-shaped. Inner cusps 

 of the lower molars pointed. 

 Oligocene ; especially abundant at 

 Ronzon, Haute Loire. A. velaunus 

 Cuvier sp., A. bovimts Owen sp. 

 In the Oligocene of Egypt, A. 

 gorringei Andrews. Oligocene ; 

 North America. A. americanus 

 Leidy, rostratus Scott, brachy- 

 rhynchus 0. and E., leptodus 

 Matthew, from successive horizons 

 of the Oligocene in South Dakota. 

 The later North American species 

 are characterised by more quadrate 

 and narrower superior molars and 

 shorter muzzle. In A. rostratus 

 Scott there is a large complete 

 pollex. 



Merycopotamus Falconer and 

 Cautley. Superior molars with 

 but four V-shaped tubercles. 

 Lower Siwalik beds, India. M. 

 nanus Lydekker. Also in Tunis. 



Rhagathermm Pictet {Hyopota- 

 mus Riitimeyer). Superior molars 

 with five pointed cusps and meso- 

 style. Superior last premolar 

 molariform, the other premolars 



very much complicated and, with exception of the first, elongated. A diastema 



in front of /*.,. B. valdense Pictet. B. frohnsteitense Kow. 



Tapindiis Gervais. Tubercles of the molars strongly compressed laterally, 



and internally joined to a crest. Upper Eocene and Oligocene Bohnerz and 



Phosphorites. 



Mixtotherium Filhol (Adrotherium Filhol ; Hyopotamus Riitimeyer). Superior 



molars similar to those of Ancodus with strong mesostyle, subtriangular. 



Cusps V-shaped with exception of the protocone. Inferior molars with 



elongated inner cusps. Premolars very complicated and elongated. Canine 



P'^ 



P- 



P- 



Anthracolheriuvi, DiMjiium Cuvier. Oligocene, La Rochette 

 near Lausanne. J, Upper jaw. 7>, Lower jaw. i/a- 



