362 



MERISTIC VARIATION. 



[part I. 



Forefoot 



*533. Horse of common breed, having a supernumerary digit on the 

 inner side of the right fore foot (Fig. 106). 



Humerus and radius: no noticeable variation. Ulna a little 

 more developed than usual ; lower end slightly broken, having 

 probably reached to lower fourth of radius. The part of the 

 inferior and external tuberosity of the radius which is usually 

 supposed to represent the ulna is larger than in the normal form. 



Fig. 106. Right fore foot of Horse, 

 No. 533. 



A. The leg seen from in front. 



B. The carpal bones enlarged. 



M, magnum, sc, scaphoid, u, unci- 

 form. t' 2 , trapezoid, t 1 , supernumerary 

 bone not found in normal, represent- 

 ing trapezium. IV, the metacarpal re- 

 presenting digit IV. Ill and II, meta- 

 carpals bearing those digits respec- 

 tively. (After Arloing.) 



Carpus consisted of eight bones, instead of seven as usual. 

 Scaphoid much larger than normal ; lunar, cuneiform and pisiform 

 normal. In the lower row the magnum and unciform have normal 

 relations, but in the place of the normally single trapezoid are two 

 bones, one anterior (f), the other posterior (t 1 ). These together 

 bear the enlarged inner metacarpal (II). The posterior of these 

 bones had a short pyramidal process lying beside the inner meta- 

 carpal. This process was partially constricted off and is regarded by 



