According to Leverett and Taylor’s map, this mastodon was buried within the borders of glacial Lake Lundy, just outside of that of Lake Rouge, a contemporary of Lake Algonquin. On page 442 of Leverett and Taylor’s monograph it is stated that the altitude of the beach of Rouge Lake is 589 feet. On the map just referred to the 600–foot contour-line runs at a considerable distance west of the locality of the mastodon find. The latter appears, then, to have been somewhere between the altitude of 589 and 600 feet above sea-level, without considering the depth the skeleton may have lain below the surface. The altitude of Lake Erie is 573 feet. It is evident that the lake had attained nearly, if not quite, its present level when this mastodon lived. Dr. E. C. Case, who superintended the excavation of this specimen, informed the writer that the bones were found 4 feet from the surface. 23. See page 88. 24. _Petersburg, Monroe County._—Alexander Winchell (Amer. Jour. Sci., vol. XXXVIII, 1864, p. 224) reported mastodon remains from this place. The town is in township 7 south, range 6 east. According to Leverett and Taylor’s map, Petersburg is within the beach which marks the old glacial Lake Warren. Probably, therefore, this mastodon lived after the retirement of this lake, unless it had lived during the time of Lake Wayne and been covered over by the deposits of Lake Warren when the waters of the latter made their advance on the land. The time of the mastodon was more probably after both lakes had ceased to exist. 23. _Saline, Washtenaw County._—Mr. N. A. Wood, of the University of Michigan, informed the writer that he had seen some mastodon remains which had been found here in 1880. No exact statements were given regarding the place. Saline is very close to the beach of old Lake Maumee, where this beach is crossed by Saline River and on the Defiance moraine. 25. See page 83. 26. _Seven miles southeast of Ypsilanti, Washtenaw County._—In 1908 (Folio 155, U. S. Geol. Surv., p. 9), Russell and Leverett stated that remains of a mastodon had been found a few years previously on the farm of Albert Darling, about 7 miles southeast of Ypsilanti, where laborers were digging a ditch across a swampy field. The lower jaw with molar teeth in place, the left tusk, teeth of the upper jaw, portions of the cranium, some vertebræ and ribs, and some of the larger bones of the limbs were found. With considerable restoration these parts were mounted and placed in the museum of Michigan University. The locality must be not far away from Huron River and within the beach of old Arkona Lake, a predecessor of the present Lake Erie. 27. See page 81. INDIANA. (Maps 5, 9.) MASTODONS FOUND IN THE UNGLACIATED REGION.