344 



0. C. Marsh — Recent Polydactyle Horses. 



more developed, especially in the coffin bone. The fourth 

 digit is represented by a strong splint bone similar to that in 

 the normal foot of the existing horse. The opposite fore foot 

 appears to correspond in all respects with the one here 

 described and figured. 



The hind feet of this animal ' present some further points 

 of importance. The first digit is wanting, but the first cunei- 

 form bone is present, and well developed.* The second digit 

 is represented by a strong, complete metatarsal, coossified along 

 its main shaft with the large cannon bone of the third digit, 

 but with both extremities free. It was supported above by 



Figure 7. — " Horned horse from Texas," showing six extra digits. 



* The name cuneiform as applied to the uluare bone of the carpus is misleading, 

 and should be discontinued, as the same word is used for two or more bones in 

 the second row of the tarsus. The name pyramidal employed by many anatomists 

 is not open to this objection, and its use for the ulnare is to be recommended. 



