Description of Bones found in a Picfs House. 209 
extremity and the first premolar socket. There is a slight 
metallic crust on the inner surface of the teeth, very distinct 
on the third tri-columnar premolar. The remaining fragment 
in this collection, No. 15, is the upper half or nearly two- 
thirds of the right middle metacarpal or cannon bone of a 
small-sized horse, from which the upper articulating surface 
is separated ; the canal for the medullary vessels is recurrent, 
and placed close to the outer edge of the groove for the inter- 
nal splint bone. The fore cannon bone in the horse is more 
flattened in an antero-posterior direction than it is in the 
hinder extremity, as in the latter it is somewhat compressed 
at the sides, and more rounded. 
