CATALOGUE OF UNGULATES 



Tertiary epoch the range included the greater part of Envope 

 and Xortli America, and, after its union with the northern 



Fig. 2. — Skull of Female Tarpan, or Mongolian Wild Horse 



(Eqicus caballiis przetoalskii), Gobi Desert, Mongolia. 



Piesented by the Duke of Bcdfonl, K.G. (7. 5. 15. 1). 



half of the New World, South America. The group prohahly 

 originated in Eastern Asia, whence it spread in one direction 

 to Western Europe, and in tlie other to North America. 



Genus EQUUS. 



Equus, Linn. Syst. Nat. ed. 10, vol. i, p. 73, 1758, ed. 12, vol. i. 

 p. 100, 1766; Griffith, Animal Kingdom, vol. ill, p. 340, vol. v, 

 p. 294, 1827; Flower and Lijdekker, Study of Mammals, p. 381, 

 1891 ; W. L. Sclater, Fauna S. Africa, Mamm. vol. i, p. 282, 

 1900. 



Dentition : i. \, c. \, p. 



3 ' 



A single toe on each foot, with remnants of the lateral 

 (2nd and 4th) metacarpals and metatarsals in the shape of 

 splint-bones (fig 1, A) ; anterior pillar of upper cheek-teeth 

 (fig. 3, -p) united by a narrow, enamel-bordered neck to the 

 dentine of the main body of the tooth ; first upper premolar, 

 when present, considerably smaller than the others, and but 

 rarely developed in existing species, in which it is commonly 

 known as the " wolf-tooth " ; slits bordering nasal bones of 



