Glass 6. Mammalia. Order 5. Ongulata. 



505 



catedj the caecum smaller than in the Perissodactyles ; the molars 

 folded or tuberculate, the premolars smaller than the true molars* 



Grroup 1. Non-Ruminantia. 



Incisors well developed ; the third and fourth metacarpals or 

 metatarsals are almost always separate, the second and fifth digits and 

 the corresponding bones usually comparatively well developed ; ulna 

 and fibula strong ; mandibular rami anchylosed ; stomach less compli- 

 cated than in the Ruminants ; in some forms of the group [e.g., the 

 Common Pig), fairly simple; in others (e.g., the Hippopotamus) with 

 definite indications of division into several sections; there is no rumina- 

 tion; mammae, often along the whole ventral side; placenta diffuse. 



Fig. 406. Manusof: ^4 Pig-, B Stag, OCamel. K radius, JJulna; s navioulare, 

 I lunar, c cuneiform, td trapezoid, m magnum, u unciform ; m^ and m° second and fifth 

 (rudimentary) metacarpals ; II — T second to fifth fingers. — After Flower. 



1. Pig family (Suidie). Limbs slender ; digits two and five are consider- 

 ably shorter than three and four, are situated somewhat behind them, and do not 

 usually touch the ground in walking ; ball of the foot small and soft ; molars 

 tuberculate ; there is a short proboscis ; skin with hahy covering. 



(a.) The Pigs (Sus) are confined to the Old World, and represented by 

 various species : i |, c a, p J, m f ,• the incisors of the lower jaw are directed for- 

 wards, those of the upper jaw downwards ; the upper canines turned outwards 

 and upwards, the lower ones much arched (those of the male grow from persistent 



* Gall bladder usually present. The number of dorsal vertebrae less than twenty- 

 two (rarely more than nineteen^ . 



