THE PEJEVALSKY HOESE. 



53 



the same bones of the Tarpan. 

 ments of some of the bones : — 



Herewith are c;iven the measure- 



Tarpa 



Length. Width. Height, 



mm. mm. mm. 



38 24 22 



31 23 27 



25 14 23 



40 36 18 



THE METACARPUS exceeds that of the Tarpan in its dimen- 

 sions, and is remarkable generally on account of its conspicuous 

 size as compared with the other bones of the same limb. In the 

 Tarpan, for example, the humerus is somewhat longer than it is 

 in E. 'prjevalshii, but, on the other hand, the metacarpus is much 

 shorter. The rudimentary metacarpal bones are shorter in the 

 Prjevalsky horse than in the Tarpan, as the following table 

 indicates : — 



Greatest length ... 



Length on the outer side 



Width at the proximal end 



Width in the middle 



Width at the distal end... 



Length of the rudimentary metacarpal bones 



THE FIPvST AND SECOND PHALANGES differ only little 

 from those of the Tarpan. In E. prjevalskii they are somewhat 

 longer and narrower but the difference is insignificant, as the 

 following measurements show : — ■ 



r Length 

 First phalanx. \ Width of proximal end 



I Width at distal end 



r Length 

 Second phalanx. I Width at proximal end 



[ Width at distal end 



E. prjevalskii. 

 mm. 

 ... 70 

 ... 46 

 ... 43 

 ... 38 

 ... 46 

 ... 43 



Tarpan. 

 mm. 

 69 

 50 

 45 

 38 

 52 

 46 



THE PELVIC GIRDLE (Fig. 22) differs from that of the Tarpan 

 in its remarkably large dimensions so far as regards its width and 

 height. The length, on the contrary, falls short of that of the 

 Tarpan's pelvis. The broad pelvis of E. prjevalskii contains a 

 very strongly developed ilium, which is closely related to its fellow 

 at the inner anterior angle. Of the other peculiarities of the 

 pelvis the remarkably deep but narrow incisura ischiadica must 



