64 MR. A. L. ADAMS ON THE OSTEOLOGY OF 



4. There is a very decided flattening of the inner side of the head, witli a far more 

 rounded and convex external aspect, both of which are very apparent when the four 

 bones are placed side by side. With respect to the two latter features it may be stated 

 that the same obtains in the adult bones (PI. XV. figs. 1 & 3), which, however, in 

 regard to the hollowing below the head behind are distinctly more like the former. 



5. The external condyloid aspect is seemingly narrower than in the former ; but I 

 feel, in the absence of more perfect materials, that I should be verging on hyper- 

 criticism to pronounce a decision on a point which gives so distinctive a character to 

 the same parts in the two recent species. 



As compared with the immature bones described by Mr. Busk, I find that the two 

 former agree with his pi. 47. figs. 16 & 17, and the latter with his figs. 15, 20, & 21. 

 He alludes to the nutrient foramen being placed higher up in the latter. This there is 

 no means of proving, from the loss of the parts in which it exists ; but in the Zebbug 

 specimen in my possession, equivalent to PI. XXI. fig. 14, it is placed in the lower third, 

 and therefore in the position assigned to it by Busk. 



X. Fibula. 



1. The largest specimen of this bone is represented by the distal extremity (PI. XV. 

 fig. 4). As regards dimensions, it is in accord with the tibia (figs. 1 & 2) and astragalus 

 (PI. XVI. fig. 1), so much so that in all likelihood all belonged to the same individual, 

 as they were found together. This distal end of the fibula has much the character of 

 the African, the lower margin being slightly concave. Here the obliquity on the tibia 

 just indicated is repeated on this fibula. 



2. The smaller distal extremity (PI. XV. fig. 5) is one of two perfect specimens 

 (right and left) found near each other in Muaidra Gap ; they do not dififer whatever in 

 dimensions, and probably belonged to the same individual. Here we find the lower 

 margin deeply notched as in the Asiatic. The tibial facet is not shown in the figure, 

 but is well defined on the bone, and is scarcely so oblique as in the last, and measures 

 2-3 inches in breadth by 0'8 inch. Both figs. 4 & 5 represent the characters of old 

 bones, although the latter has been broken across at its lower epiphysis. The former 

 represents an individual of the largest dimensions above stated ; the latter, one having 

 an astragalus of the dimensions of PI. X. fig. 10, which will be shown to have some 

 characters in common with the Asiatic and Mammoth rather than the African. 



3. An entire detached fibula was discovered in Benghisa Gap, belonging doubtless to 

 the smallest form ; the epiphyses were completely consolidated ; and, like the others, it 

 displayed all the characters of an old bone. The entire length was 8-6 inches, girth of 

 the proximal end 2-5, girth of the mid-shaft 2, girth of distal end 4-4, breadth of distal 

 end 2-6. A detached distal end of another fibula from the same situation measured 

 2'2 inches in breadth. 



Summary. — Supposing, as Mr. Busk computes, the femur of Falconer's Elephant to 



