50 
Proceedings of the Royal Society of Edinburgh. [Sess. 
Some importance has been attached by Salensky to the relative width 
of the most anterior region of the face (“ muzzle ”)• In order to compare 
the three skulls in this respect the maximum width of the premaxillse 
(measured from the bases of the third incisor teeth) was determined, and, 
the length of the face being held as equal to 100, an index was calculated. 
TABLE Y. 
E. prjevalskii. 
Celtic. 
Iceland. 
Width of premaxillse, .... 
66 
61 
70 
Index (length of face =100), . 
17-83 
19-21 
20-83 
It is clear that, in comparison with the length of the face as a whole, 
the wild horse had a narrow premaxillary region. 
The chief points brought out by the above observations may be 
summarised as follows : — The actual width of the cranium of the wild horse 
was narrower than an examination of the animal during life would have 
led one to suppose. The face of the wild horse was long and narrow, and 
formed a considerable proportion of the total length of the skull. The 
Iceland face, on the contrary, was short and broad. The orbit of the wild 
horse had an elongated rim, and was placed relatively far back in the head. 
The premaxillary width in Equus prjevalskii was relatively less than in 
the other two skulls. 
{Issued separately April 29, 1907.) 
