1. _Bigbone Lick, Boone County._—In 1831, Dr. Richard Harlan (Monthly Amer. Jour. Geol., vol. I, p. 77, plate III, figs. 1 to 3) described a left ramus of the lower jaw of a ground-sloth which had been brought to New York. This jaw he referred to his _Megalonyx laqueatus_ (_M. jeffersonii_); but it was later shown by Owen (Zool. Beagle, 1840, p. 68) to belong to _Mylodon_, and he named it _M. harlani_ in honor of Dr. Harlan. From Cooper (Monthly Amer. Jour. Geol., vol. I, p. 172) it is learned that this bone had formed part of the Finnell collection at Cincinnati. So far as the present writer sees, there was nothing in Harlan’s article to show where the jaw was discovered. In 1855 (Smithson. Contrib. Knowl., vol. VII, p. 47, plate XIV, figs. 1, 2), Leidy further described and illustrated the specimen and stated that it was found at Bigbone Lick. In 1903, Barnum Brown (Bull. Amer. Mus. Nat. Hist., vol. XIX, p. 511) stated that Harlan’s specimen ought to be in Columbia University, but it could not be found. It is more probable that it was destroyed in a fire in the old American Museum of Natural History. In his report on Bigbone Lick (op. cit., p. 171), Cooper stated that he had seen in the “Western Museum,” Cincinnati, a large humerus of a megalonyx. Cooper further wrote that he and a companion had found at the lick a metacarpal bone which he supposed belonged to the same animal. The humerus was described and figured by Harlan (Jour. Acad. Nat. Sci., Phila., ser. 1, vol. VI, p. 277, plate XIII, fig. 10). Cooper (op. cit., p. 172) mentions other bones of _Megalonyx_ found at Bigbone Lick, but some may have belonged to _Mylodon_. This is the case with the fragment of lower jaw with 4 teeth which became the type of _Mylodon harlani_, as above mentioned. In Princeton University there is an ungual phalanx 167 mm. long, 66 mm. high, and 43 mm. thick at the middle of the height. This is labeled as having been found at Bigbone Lick. A list of the species discovered at this place will be found on page 403. 2. _Bluelick Springs, Nicholas County._—In the collection made by Mr. Thomas W. Hunter, in the sulphur spring at the place mentioned, the writer has seen two ungual phalanges which were identified as those of _Megalonyx jeffersonii_. 3. _Henderson, Henderson County._—A considerable part of a skeleton of _Megalonyx jeffersonii_ was found at different times extending through some years, about 5 or 6 miles below Henderson, in the bank of Ohio River. This skeleton is now in the University of Indiana and was described by Leidy in 1855 (Smithson. Contrib. Knowl., vol. VII, art. 3). This collection furnished a fine skull and lower jaw. In the same deposits were found many horns and bones of deer. The geology of the locality and the age of the bones will be discussed on page 405. FINDS OF PLEISTOCENE MASTODONS IN EASTERN NORTH AMERICA. ONTARIO. (Map 5.)