ONTARIO.
(Map [26].)
1. Toronto, York County.—Through the kindness of Professor B. A. Bensley, of the University of Toronto, the writer has had the opportunity to examine a malar bone of a bison found in the Don interglacial beds at Toronto. It is slightly water-worn and the edges are somewhat injured. The bone has been compared with the corresponding one of a large specimen of Bison bison, No. 22374 of the U. S. National Museum, and with a complete skull of Bison alleni from Alaska. The Toronto bone is about one-third larger than that of the Bison bison and about one-tenth larger than that of B. alleni. The projecting outer plate, immediately below the orbit, narrows little if any from behind forward, while in both the other species referred to it becomes much narrower toward the front. The bone quite certainly belonged to an extinct species, but without the horn-cores it is impossible to determine to which one.
In 1901 (Jour. Geol., vol. IX, p. 301), Coleman stated that a large atlas vertebra of a bison which he thought might belong to B. americanus had been found in interglacial beds in Toronto. It is more probable, however, that it belonged to one of the extinct species. It is uncertain whether the deposits belonged to the Don series or the Scarboro.
The geology of this region is treated on pages [281] to [283].