124 UNDERHILL : 



because of their appearance iti Kugland, Northern Italy and 

 Northern India in the same geological period in which they 

 are found so abundantly in America, and also from the fact 

 that a distinct connecting link between this horse and his 

 three-toed ancestors has been found only in America. The 

 fact that the camel appears simultaneously with the horse in 

 the European series, lends support to this conclusion, as there 

 is no doubt that the camel is an exclusively American bred 

 animal, sharing the Preglacial uplands with the horse, and it 

 is most likely that he migrated to the Old World at about the 

 same time. At the end of the Tertiary Age the continents 



RESTOR.^TION OI-" KOrR-TOKD AXCKSTOR OF HORSK 



Pen sketch from photo in American Mnsenm Booklel b\- Dr.W. D. ^Matthew, 

 from watercolor \)y C. R. Knight, based on nionnled skeleton. 



stood higher above sea-level than at present, and the plains, 

 with their covering of grass, had come into existence. At 

 this time there was land connection between North America 

 and Asia, and it is then that our American Wild Horses are 

 supposed to have started on their jotirney to the Old World. 

 Among these immigrants was the Equus stemviis, which has left 

 its remains in the Pliocene deposits of Britain, France, Swit- 

 zerland, Italy and North Africa. Two others, Kqiiiis si^rilensis 

 and /ujuiis namadicus, found their way into India, while other 

 species probably settled in Central Asia. It is believed by 



