ARTIODACTYLA, SUIDAE. 



581 



Fia. 300.— Skull of Susscrofa ferut. 



ulna and fibula are complete and separate from the radius and tibia. 

 There is a single precava. The stomach is fairly simple, with a cardiax3 

 pouch and a groove leading towards the pylorus from the oesophageal 

 opening. There is a cs/ecum. The placenta is diffuse, the teats are 

 abdominal and the testes descend into a scrotum. Living forms 

 are confined to the Old 

 World. Fossil remains 

 are firs found in the 

 Eocene of Europe and 

 N. America. Sus L., 

 milk dentition i ^ c \ 

 m I ; permanent denti- 

 tion i|c tPI «i|; 

 the canines have per- 

 sistent roots and project 

 as tusks, less developed 

 in the female ; gestation 

 16-20 weeks ; palaearctic 

 and oriental regions, in 

 other regions introduced by man ; S. scrofa L., wild boar, with many 

 varieties ; the source of the various breeds of domestic pig is vinknown ; 

 S. salvanius Hodg., no larger than a hare, India ; 13 other species are 

 distinguished and many extinct from the Miocene onwards. Potamo- 

 chaerus Gray, river-hogs, Africa and Madagascar. Babirussa Less., i | 



c i p f m I, 

 enormous can 

 ines in the male, 

 the upper pierc- 

 ing the skin, al- 

 most hairless, 1 

 species, Celebes 

 and Burn. 

 Phacochoerus G. 

 Cuv.,wart-hogs, 

 with large cuta- 

 neous lobes on 

 each side of the 

 face, i} c T p f 

 m f ; teeth tend 

 to disappear 

 with age except 

 the canines and 

 posterior mol- 

 ars, which latter 

 attain an enor- 

 mous develop- 

 ment, owing to 



Via 301 Left side view of dentition of the boar {Sus scrofa), showing 

 roots exposed (from Flower and Lydekker). t incisors, c canines, 

 pm premolars, m molars. 



the great number and elongation of the tubercles ; the form of the 

 last molars and the fact that the anterior grinders are graduaUy 

 worn down and disappear, lea^dng the last only, constitutes an 

 approximation to the condition in elephants ; 2 sp., Africa The foUowing 

 extinct genera, maiiy tending to connect the Suidae and Dicotyhdae are 

 placed with the Suidae ; some of them show aflfimties outside these 



