WILD TARPAN AND ITS RELATIONS 93 



superficial (diluvial) formations of his own country ; 

 and the title E. adamiticus had been given a dozen 

 years earlier by Schlotheim 1 to the remains of the 

 same or a closely allied type of horse. 



At a later date the English naturalist Sir 

 Richard (then Professor) Owen, 2 referred an upper 

 molar of a horse from Kent's Hole Cavern, near 

 Torquay, to von Meyer's E. fossilis ; stating that 

 it differed from molars of domesticated horses by its 

 narrower crown a feature that may perhaps be 

 due to its belonging to the deciduous, or milk, 

 series. Other upper molars from the cavernous 

 fissures in the Devonian limestone of Oreston, 

 between Plymouth and Tavistock, were assigned 

 by Sir Richard Owen 3 to a second species, under 

 the name of E. plicidens, in reference to the sup- 

 posed more complex foldings, or pleatings, of the 

 enamel in the central islands, or pits, of the grind- 

 ing surface of the crown. 



Twenty-five years later the same naturalist 4 

 described a number of equine remains from the 

 cavern of Bruniquel, in the department of Tarn-et- 

 Garonne, France. These, in place of being isolated 

 molars, comprised specimens of the complete denti- 

 tion, as well as limb-bones ; and, from the relatively 

 large size of the former as compared with the latter, 



1 Petrefaktenkunde, p. n ; 1820. 



2 British Fossil Mammals and Birds, p. 383, London, 1846. 



3 Op. tit., p. 392, and Rep. Brit. Assoc. for 1843, p. 281, 1844. 



4 Owen, Phil. Trans, Roy. Soc. London, 1869, p. 544. 



