ARTIODACTYLA 7 



B. Upper incisors present. 



a. Dentition selenodont ; cannon-bones with di- 

 verging smooth inferior surfaces (fig. 1 C) ; 

 feet cushion-like, with large nails. 

 Euminating TYLOPODA.. 



Lateral toes wanting. Asia, Africa, and 



South America Camelid.^. 



h. Dentition bunodont ; metacarpal and metatar- 

 sal bones of main toes separate. Non- 

 ruminating SUINA. 



a'. Muzzle elongated into a snout terminating 

 in a soft fleshy disc perforated by 

 the nostrils ; feet narrow, encased 

 in complete hoofs ; lateral toes not 

 reaching ground (fig. 1 A). 



a". Toes 4-3 ; tips of upper canines 

 directed downwards ; a dorsal gland. 

 America DicotylidjE. 



h". Toes 4-4 ; tips of upper canines curving 

 upwards ; no dorsal gland. Old 

 World SuiDiE. 



h'. Snout broad, bristl3% not forming a disc; 

 feet short and broad, with large hoof- 

 like nails ; lateral toes touching 

 ground. Africa Hippofotamid2E. 



The following special terms are often used in connection 

 with even-toed ungulates : — 



Micffie, or rhinarium, the bare moist area around and 

 between the nostrils. 



Freorhitccl gland, or larmier, a gland, opening on the 

 face by a circular or longitudinal orifice, in front of the eye ; 

 usually contained in a pit in the skull known as the 

 laclirymcd fossa (fig. 5). Generally referred to as face-gland 

 in the sequel. 



Laclirymal fissure, an unossified space in the skull near 

 the lachrymal fossa. 



Siipraorhital fits, a pair of pits in the frontal bones of the 

 skull. 



IiKjiiiiial glands, glands in the groin. 



Pedal or foot-glands, glands situated above or between 

 the two main hoofs, and discharging by means of a small 

 orifice situated on the front surface of the foot. 



