46 



THE PRJEVALSKY HORSE. 



skeleton of the Tarpan, the corresponding measurements were not 

 undertaken : — 



Cervical vertebrae. 



Length of centrum 



Width of anterior articular processes ... 

 AVidth of posterior articular processes... 

 Width of anterior part of transverse processes 

 Width of posterior part of transverse processes 

 Height of the vertebra to the extremity of 

 spinous process 



the I 



78 84 70 68 



THE THORACIC VERTEBRAE— The number of thoracic verte- 

 brae is normal; namely, eighteen. The first vertebra (Fig. 15) has 



^^H- IS- — First thoracic vertebra (lateral aspect). 



the characteristic attributes which distinguish the same bone of E. 

 oaballus, and by which it is differentiated from the corresponding 

 vertebra of the donkey. Its spinous iDrocess is sabre-like in form, 

 with fairly smooth surfaces. The anterior articular processes are 

 wide, as in the horse, but the interval between the anterior and 

 posterior articular processes is level and not convexly arched. 

 This peculiarity distinguishes the first thoracic vertebra of E. 

 prjet^ahkii from the same bone of the domestic liorse and of the 

 Tarpan. The eighteenth vertebra (Fig. 16) is only different from 

 the corresponding bone of the domestic horse in that the articular 

 depressions on the transverse processes are small. In general it 

 closely resembles the type of the same bone of the domestic horse. 



THE LUMBAR VERTEBRAE.— ^. j,rjevaJsl-ii possesses only 

 five lumbar vertebrae. This number was considered by Franck 



