0. C. Marsh — Recent Polydactyle Horses. 



341 



allied topics. In the present paper, it is intended merely to 

 state the more important facts, and what they indicate, leaving 

 the full discussion for another occasion. 



The cases of supernumerary digits in the existing horse now 

 known to the writer may be roughly classified, as follows : 



(1) An extra digit on one foot. This is always much smaller 

 than the main, or third, digit, the largest seen being about one 

 half its size, and the smallest, very diminutive. This extra 

 toe is almost invariably on the inner side of the main digit, 

 and usually on the fore foot. Not infrequently it may be 

 entirely beneath the skin, the only external evidence of it being 

 a prominence, which, on close examination, will often be found 

 to contain, below the splint bone, two or more movable phal- 

 anges, but sometimes only a single one, and very small. 



(2) A corresponding extra toe may be present on the other 

 fore foot, equally developed with the opposite one, but occa- 

 sionally much smaller, or even concealed under the skin, f^?*, 



(3) A second extra digit may exist with those above described, 

 but outside the main digit. This toe, as a rule, is smaller than 

 the inner one, but may equal or exceed it. 



Figure 5. — " Clique, the horse with six feet," showing two extra digits. 



