SUS PALUSTRIS. 



207 



go, the horse, even if present in the Stone Age, seems to have 

 been rarer than at subsequent periods. All the remains of 

 this animal belonged apparently to the domestic horse (Equus 

 caballus), while those which occur in the Drift gravel beds 

 and in caves fall into two well-marked races, named by Prof. 

 Owen, E. fossilis and E. spekeus. 



" The genealogy of the domestic hog," says Mr. Boyd Daw- 

 kins,* " has been ascertained by MM. Elitimeyer, Nathusius, 

 and Schiitz, with great accuracy, and Dr. Darwin has summed 

 up the evidence with judicial impartiality.^ It is traced, by 

 these observers, to two distinct strains, the one being the 

 wild boar, which is found throughout the temperate and hot 

 regions of Europe, Asia, and in North Africa ; and (the other) 

 that which is termed by Nathusius the Sus Indica, of Pallas, 

 and which is known commonly as the small, short-legged, 

 and short-headed pig of Siam and China." 



FIG. 169. 



\N-IV 

 Part of the Vertebra of a Cow. 



M. Elitimeyer, in a letter with which he has favoured me, 



* Palreontograpliical Soc. 1878, t Variations under Domestica- 



vol. xxxii. p. 13. tion, vol. i. ch. i. 



