266 MR. BUSK ON THE REMAINS OF 
infratrochanteric fossa, the existence of which, so far as I am aware, is peculiar to Z. 
falconeri. On the posterior aspect the base of the trochanter major, or rather the 
posterior and external angle of the shaft going to it, is very much more elevated, as is 
also the surface of the bone on the inner side of this face. The central part, consequently, 
just below the level of the lowest point of the digital fossa, is much more concave in 
E. falconeri. 1n fact, the most cursory inspection of these two portions of the femur is 
sufficient to demonstrate the extreme difference between them. It will have been ob- 
served that in some particulars the femur of Z. falconeri exhibits African tendencies, 
which is a curious circumstance when we remember the numerous instances, in other 
parts of the skeleton, in which the contrary tendency would seem to be manifested. 
With respect to the dimensions of the entire femur, as deduced from those of the 
fragment, and from the length of what I regard as the corresponding humerus, its length 
may probably be taken at about 13” or 14”, and the diameter of the head in the fully 
mature animal at about 1:8, or 2”. The latter dimension is less than would accord 
with the size of the acetabulum in the portion of pelvis here referred to the same 
species, which demands a head of about 2” in diameter at least; and I am able to 
explain the apparent discrepancy only on the ground, either that the proportion of the size 
of the head to that of the shaft was rather greater than usual in EF. falconeri, or, as is 
perhaps more probable, that the pelvis in question belonged to an older and larger in- 
dividual of the same species. But the fact that the comparative size of the head in 
proportion to the length of the shaft varies very greatly, not altogether in accordance 
with age, is apparent in the circumstance that, if we deduce the size of the head in 
E. falconeri from the proportions exhibited in the femur of Chuny, it would be about 
1-9; whilst if we take the proportions in a somewhat younger, but very much smaller, 
Sumatran Elephant in the British Museum, it would be only 1'°5, and, from those of 
a Ceylon Elephant also in the British Museum, 1-7, and, from those of the African, 
1-6. And these examples have been selected as being, I believe, those of animals 
as nearly as possible (except the Sumatran) of the same age, or with the dentition in 
nearly the same stage—that is to say, with the three molarsin wear. In all of them the 
femoral and many of the other epiphyses are still not united, Upon full consideration, 
therefore, I think it not unsafe to conclude that the apparent discrepancy between 
the size of the acetabulum and the computed size of the head of the femur represented 
in fig. 30 is not greater than may be looked for within the limits of one and the same 
species. 
A second instance of the femur of #. falconeri is that represented in figs. 29 & 29 a, 
It consists of the entire shaft of the left femur with both epiphyses detached ; and it 
is also, from its taper form and all its other characters, manifestly that of a very young 
animal. On the anterior aspect the great concavity on the outer side, immediately 
below the base of the trochanter, at once marks the peculiarity of the bone and its re- 
semblance to the older femur last described. On the same aspect is seen the nutrient 
