SUBORDER D 



ARTIODACTYLA 



175 



Dicotyles Cuvier. Dental formula 



2.1.3.3. 



Superior canines triangular, 



3.1.3.3. 



vertical. Premolars and molars with two pairs of main cusps and small 

 accessory conules. Diastema long. Ulna united with radius. The two 

 median tarsals partially coalesced. Metatarsals III. and IV. proximally 

 fused. Metatarsal V. reduced. Recent and Pleistocene ; North and South 

 America. 



Platygonus Le Conte. Only three premolars, with long diastema preceding 

 them. Premolars bicuspid. Cusps of molars joined to crests. Upper Miocene, 

 Pliocene and Pleistocene ; North America. 



Pros//ie?Mw^s Matthew and Gidley. Superior dentition : 2.1.3.3. Diastema 

 moderate. Upper Miocene (Loup Fork beds) ; Dakota. 



Fig. 237. 



Listriodnn splendens Meyer. Miocene (Sarmatian), Nussdorf, Vienna. 

 A Premolars and first molar of upper jaw. iJ,jSecond lower molar, s/^. 



Fig. 238. 



Sus erymantliius Roth and Wagner. Lower Pliocene, Pikeriui, Athens. 



Upper cheek teeth. 1/2- (After Gaudry.) 



Sus scrofa Linn. Tarsus 

 and base of metatarsus. 

 1/3. (After Flower.) 



Doliochoerus Filhol. 

 Phosphorites. 



Cusps Avith crest-like arrangement. Oligocene ; 



Listriodon Meyer (Fig. 237). Dental formula : 



3.1.3.3. 



Superior incisors 



3.1.3.3 



broad, triangular, and bent upward ; inferior, directed obliquely forward. 

 Superior canines very thick, short, triangular, bow-shaped, curved upward ; 

 lower canines long, triangular, strongly curved, with worn posterior surfaces. 

 Molars with two transverse crests, superior premolars trigonodont. Middle 

 and Upper Miocene ; Europe. L. splendens Meyer. Also Siwalik beds ; India. 



Hippohyus Falconer. Tubercles with numerous folds of enamel. Siwalik, 

 India. 



Sus Linn. (Figs. 238, 239). Incisors and canines as in Listriodon, molars 

 with four blunt main cusps and numerous wart-like accessory tubercles. 

 Third superior molar with long talon. Now living in Europe, Asia, and 



