One of the lower teeth has a length of 342 mm. The height at the first unworn plate, about the fourteenth, is 135 mm. On the outer face there are six plates in a 100–mm. line. Not knowing exactly where these teeth were found or at what depth, not much can be said regarding them. However, the region about Three Oaks is occupied by Wisconsin drift and the animal quite certainly lived during the Late Wisconsin stage. As shown by the map of mastodons in Michigan (map 8), at least three specimens of the American mastodon have been found in this county. It is extremely probable that the two species lived together. 2. _Eaton Rapids, Eaton County._—In the Michigan Agricultural School, at East Lansing, is a lower jaw (No. 8260) of _Elephas primigenius_, found at Eaton Rapids, on the Grand River. Dr. A. C. Lane (Ann. Rep. Geol. Surv. Michigan for 1905, p. 553) says that it was found 2 miles below the town. It was found in 1904 by Charles H. Fry. The jaw contains a tooth on each side, and in front of each is a socket for a missing tooth. Behind the tooth is a cavity in the jaw for a succeeding tooth. The one present is taken to be the first true molar. There are present 13, possibly 14, plates. The length of the tooth is 123 mm., its width 51 mm. The enamel is thin and little crinkled. The jaw is 100 mm. high at the rear of the tooth present. Eaton Rapids is situated on the Grand River, where the latter breaks through the Charlotte morainic system. In this county there have been found two mastodons, one about Belleview, the other in the vicinity of Olivet. INDIANA. (Map 11.) IN AREA COVERED BY ILLINOIAN DRIFT. 1. _Otter Creek Township, Vigo County._—In Ward’s Natural History Establishment, Rochester, New York, the writer saw a pair of upper second molars which, in 1885, were found in Otter Creek Township. They were dug up on the farm of W. H. Stewart, while making a ditch in low ground. From information received from Mr. S. D. Humphrey, North Terre Haute, it appears that the locality is not far from the common meeting-point of sections 8, 9, 16, 17 of township 13 north, range 8 west. The complete tooth, the one of the left side, had 22 plates and a front and a rear talon. The length was 248 mm., the width 96 mm. There were 10 plates in a line 100 mm. long. This thinness of the plates is evidence as to the specific identity of the animal. 2. _Madison, Jefferson County._—The collection of the Academy of Natural Sciences, at Philadelphia, contains a large lower last molar of the right side, presented by Dr. Hallowell in 1840, and labeled as coming from Madison. The length is 245 mm., and there are 9 plates in 100 mm. This tooth was mentioned by Dr. Leidy in 1869. From the information furnished one can conclude only that _Elephas primigenius_ once lived in southern Indiana.