434 Dr. J. E. Gray on Pigs and their Skulls. 



peccary has the white collar well marked in this stage, but 

 it much sooner assumes its dark livery tlian the white-lipped 

 peccary. 



This family contains only two recent species, Notopliorus 

 torquatus and Dicotyles labiatus. The skulls of the two genera 

 are very different, and are immediately known from one 

 another — the skull of Notopliorus having a groove of a vessel 

 over the eye curved to the lateral margin, then bent back over 

 the canines and continued to the end of the nose. In Dicotyles 

 labiatus the groove of the vessel over the orbit is only continued 

 to the lateral margin of the front of the zygomatic arch. It 

 is to be observed that De Blainville, in his ' Ost^ographie,' 

 figures them both under the name of Sus torquatus^ t. iii. & v. 



Subsection 2. Artiodactyla. Fore and hind feet with four toes ; the 

 lateral toe of each side much shorter. The Eastern Hemisphere, 

 or Europe, Asia, and Africa. 



Family Suidae. 



Head conical. Upper canines of the males elongate and 

 more or less recurved, and enclosed in a bony sheath at the 

 base. Teeth 40-44 ; cutting-teeth 1^^ • premolars |^ or p^- 

 Teats ten, rarely eight. Skull with the sides of the nose in 

 front of the orbit more or less deeply concave. Tail elongate. 



The males have a large thick canine and a longitudinal ridge 

 over tlie sheath of its base ; this ridge is wanting in the 

 females. 



The swine of the western hemisphere have four toes on the 

 front and hind feet. 



Tribe I. Potamoch(erina. 



Ears elongate, attenuated and pencilled at the end. The 

 concavity in front of the orbit without any ridge on the 

 lower part from the front of the zygomatic arch. The sheath 

 of the upper canines expanded out, of the males largest and 

 with a ridge across its upper surface, of the females often 

 bent up at the outer margin. 



1. PoTAMOCHGERUS. Africa. 



Tribe II. Suina. 



Ears rounded, in the domestic state elongate, drooping, not 

 pencilled at the end. The concavity in the skull in front of 

 the orbit with a ridge on the lower part from the front of the 

 zygomatic arch. Cutting-teeth |^. The front grinders close 

 to the back of the upper canine, which in the males is bent 



