In the same institution (J. A. Udden, Augustana Coll., Pub. No. V, p. 12) is a part of a proboscidean tusk, referred to the mastodon, which Dr. Udden states was found near Milan, at the base of the loess, in the red oxidized layer of the Illinoian boulder clay. The locality is on the north side of Rock River and on the east side of the Milan road south of Rock Island. The conditions would seem to indicate that the animal had lived about the close of the Illinoian drift stage. About June 15, 1916, Mr. A. Daxon, of Omaha, Nebraska, sent photographs of two mastodon teeth to the U. S. National Museum for identification. These teeth were found in Bowling Township, Rock Island County, 10 or 12 miles south of Rock Island, but no further information about them has been secured. Professor J. A. Paarmann, curator of the Davenport, Iowa, Academy of Sciences, has written that he had seen a finely preserved mastodon tooth which had been picked up on the surface of the ground a mile west of Milan. The land around about is swampy. The tooth was in the possession of Edward Herbert, Rock Island, Illinois, but the present writer has not been able to get any information from him. 13. _Sterling, Whiteside County._—In the U. S. National Museum (No. 4222) is a mastodon molar, recorded as found near the town named. It was transmitted through the U. S. Geological Survey and credited to T. A. Schroder. It is said to have been found with other teeth and parts of the skeleton, so that there is little probability that the skeleton was disturbed after its original interment. It is to be regretted that so little information was allowed to come with the specimen. Sterling is in a region of very complicated Pleistocene geology. South of it is an extensive region of swamps and deposits referred by Leverett (op. cit., plate VI) to “sand and gravel plains of Wisconsin age.” North of the town is drift mapped by Leverett as Iowan, but which is now regarded as Illinoian. As to the age of the tooth in question, no probable conclusion can be formed, except that it is of post-Illinoian time. 27. _Walnut, Bureau County._—In the American Museum of Natural History, in New York City, there are three molars (No. 10666), belonging to each side of the upper jaw of a mastodon which was found somewhere near Walnut, in Bureau County. 14. _New Milford, Winnebago County._—According to S. P. Lathrop (Amer. Jour. Sci., vol. XII, 1851, p. 439), a large tooth of a mastodon, in a fine state of preservation, was found in the Kishwaukee River, being brought up in a seine. The geology about New Milford is not well worked out. The deposits along the Kishwaukee were probably laid down during or shortly after the Wisconsin stage.