THKEB EXTINCT SPECIES OF ELEPHANT. 



257' 



the Indian, being usually considerably above the middle in the latter, and as low as 

 the commencement of the lower third in the former. But, besides the difference in the 

 proportionate size of the condyles to each other, they differ not inconsiderably in form 

 in the two species. The contour of the outer condyle in the African humerus is more 

 globose or rounded towards the outside ; and, owing to this and to the circumstance 

 that, whilst the middle part of the trochlea is of about the same diameter as in the 

 Indian, and the condyles themselves are rather smaller, the transverse contour-line of 

 the articular surface at the lowest part is widely different in the two cases, as may be 

 seen in the subjoined reduced outlines. 



12 & 14. — EUphas africanus. 



1.3 & 15. — Elephas Indicus. 



And it is also to be remarked that another important difference exists in the transverse 

 contour-line of the condyles, behind or across what may be called the intercondyloid 

 sulcus, which line in the African humerus forms an easy sigmoid curve, whilst in the 

 Indian the intercondyloid depression is bounded on either side by an abrupt border, as 

 may be better seen in the accompanying figures. 



In the African humerus the surface of the shaft above the olecranon-fossa is more 

 concave than it is in the Indian, and the internal condyloid ridge more acute. And in 

 the Indian humerus there is a considerable depression about the middle of the supinator 

 ridge behind, which does not exist in the African specimen examined. A further im- 

 portant distinction also is seen on the posterior aspect of the bone in its upper half. In 



