10. _Cannonsburg, Kent County._—In the Kent Scientific Museum at Grand Rapids is a lower left last molar, labeled as having been found at Cannonsburg, by Henry Detmer. The exact locality of the place where the tooth was found is unknown to the writer. The tooth is only slightly worn and is of a white color. Cannonsburg is on a great expansion of what Leverett and Taylor call the Charlotte morainic system, a system produced by the Saginaw lobe of the Wisconsin glacier. Being one of the more distant moraines of the Saginaw lobe, it was one of the earliest to be freed from ice and to offer itself to animal occupancy; but it may not have been invaded by mastodons until the glacial wall had moved much farther away. 11. _Moorland, Muskegon County._—In the Kent Scientific Museum at Grand Rapids, Michigan, is a mounted mastodon, the bones of which, except the limbs, belong to a specimen found about 1905 in a swamp north of Moorland. The exact locality, as given by Mr. C. L. McKay, the finder, is the northwest quarter of the northeast quarter, section 16, township 10 north, range 14 west. The skull and the tusks are in good condition. Beneath the skeleton was found the skull which was made the type of _Boötherium sargenti_ Gidley. The Moorland swamp forms part of a great plain about 25 miles wide lying between the “Lake border morainic system” (Leverett and Taylor, p. 222) and the present eastern shore of Lake Michigan. This plain appears to have been occupied by either ice or the waters of old glacial lakes until well near the close of the Wisconsin stage. The animal must have been one of the latest of his tribe to inhabit the State of Michigan. It may have lived long after the time of the musk-ox on whose skull the mastodon’s pelvis was lying. 12. _Williams Township, Bay County._—In the annual reports of the Geological Survey of Michigan (1901, p. 253; 1905, p. 354), the discovery of the skeleton of a mastodon in Bay County was announced. It had been found in a depression called a pot-hole. The locality more accurately given is in the southwest corner of section 3, township 14 north, range 3 east. There was a fragment of a tusk 8.75 feet long and but little curved, a femur and its socket 9.5 inches across, one vertebra, and one tooth. These were found 3 or 4 feet from the surface. The remains were sent to Ypsilanti. An examination of Leverett and Taylor’s plate XVII (Monograph LIII) indicates that the mastodon could not probably have lived there until after the time of Lake Warren. At that time the ice-sheet occupied most of Lake Huron and a part of Saginaw Bay, but the climate of that region was probably, for a long time after the passing of Lake Warren, too raw and cold to please the mastodon, so that it was long afterward that this individual left his skeleton in the boggy hole.