loo THE HORSE AND ITS RELATIVES 



Dr. Duerst describes under the same name, is 

 characterised by the large and heavy head and the 

 relatively slender limbs, the face being long and 

 narrow. 



The second of Mr. Ewart's groups is the so- 

 called plateau-type, which appears to be typified 

 by bones and teeth from French and English 

 Pleistocene deposits, and is said to be a fine-headed, 

 slender-limbed pony, standing from 12 to 13 hands 

 at the shoulder, with short grinding surfaces to the 

 anterior pillars of the upper cheek-teeth, and a 

 forehead of medium proportionate breadth. For 

 this plateau-type Professor Ewart, on page 2>^^ of 

 the work just cited, adopts the name Equus agilis ; 

 remarking in a foot-note that it includes a northern 

 or "Celtic," and a southern or "Libyan," variety. 

 The name E. agilis was proposed by him in 1910^ 

 to replace E. gracilis, which he published in 1909,^ 

 but subsequently found to be inadmissible on 

 account of having been previously used in another 

 sense. In the original publication of the last- 

 mentioned name, it was stated that it was meant 

 to replace the inadmissible Asinus fossilis of Owen, 

 and it was likewise mentioned that it was intended 

 to include, as varieties, the author's E. celticus and 

 the E. libycus of Professor Ridgeway. Such nomen- 

 clature is, however, totally inadmissible, the name 



^ Ewart, Proc. Royal Soc. Edinburgh, vol. xxx. p. 299, 1910. 

 * Ewart, Proc. Royal Soc. London, vol. xxxi. p. 392, 1909. 



