THE PEJEVAL8KY HOESE. 



45 



consequence that the depression is shallower and narrower than in 

 the domestic horse. The anterior (cephalic) intervertebi-al notch 

 is not converted into a foramen as in the case of the horse. It is 

 noteworthy that in the Tarpan the foi-amen is present on the right, 

 but on the left there is a notch. 



The following are the dimensions of the axis vertebra of the 

 Prjevalsky horse: — 



Length to the tip of the odontoid process ... 



Height to the extremity of the processus spinosiis . 



Height of the neural foramen... 



Vertical diameter of the caudal end of the centrum 



Greatest Lreadth of the centrum 



Length of the processus spinosus 



Breadth of the articular surface for the atlas 



Greatest breadth of the transverse processes 



Breadth of the articuhir processes 



mm. 



141 

 79 

 55 

 45 

 45 

 78 

 82 

 90 

 66 



THE THIRD, FOURTH, FIFTH, SIXTH (Fig. 14) AND 

 SEVENTH CERVICAL VERTEBRAE.— I do not propose to give 



V . , I 



Fig 14. — Sixth cervical vertebra (lateral aspect). 



a description of each of these vertebrtTe, but will confine myself 

 to the peculiarities of one of them, namely, the sixth. This verte- 

 bra presents all the characters by which the corresponding bone 

 of E. cahallus can be distinguished from that of the ass. The 

 middle portion of the transverse process is higher than in the 

 sixth cervical vertebra of the donkey, and is not curved so far 

 backwards. The spinous process is of the same moderate height 

 as in the horse's vertebra. The dimensions of four cervical verte- 

 brae are given in the following table (the fifth vertebra was not 

 measured because its spinous process was broken off). In the 



