132 Scientific Intelligence. 
infra spinal surface. From this fact one might be led to conclude that 
the concavity in question is merely an individual peculiarity, and does 
not occur generally in the species; but it is rare to meet a mere osteo- 
logical variety so perfectly alike in form in the two limbs as it is in our 
Swan River scapule, and, as we presume it to be, in both shoulder- 
Mr. Koch’s skeleton, when first brought from America for exhibition 
in this country, had its parts not only misplaced, but composed of the 
bones of more than one individual, there being at least five vertebrae 
too many in the spine. It may therefore be, that the two scapula now 
forming part of the skeleton of the British Museum Mastodon, and the 
two detached ones, are in reality bones of the American fossil Elephant, 
of which a cranium of great size was purchased by the Museum irom 
Mr. Koch. Dr. Warren has shown that the Mastodon giganteus and 
the great fossil Elephant were coeval (op. cit. p. 142); and Mr. Koch 
may have dug up the remains of both animals from the same deposit. 
Not the least doubt rests on the authenticity of every part of Dr. War- 
ren’s skeleton of the Mastodon,—the account of its discovery and dis- 
in this case the comparison is less satisfactory, from the surface having 
partly scaled off in the Yukon fossil, The circumferences of the 
proximal articulations are not perfect in either bone, but the parts 
which remain present no dissimilarities. 
Dimensions of tibie alipers. 
Length of the medial face of the shin bone from the brim of ss 
{he kmee-joint to that of the ankle bone, .. tin 186% 
Length of the fibular face from the brim of the knee-joint to 
* KT. < So. a Io il ti ee tal F f the British Museum. i 
