1. _Tunkhannock, Wyoming County._—In 1883 (2d Geol. Surv. Pennsylvania, G^7, p. 20), Dr. I. C. White reported that the tusks and the teeth of a mastodon had been found at Tunkhannock. At the mouth of Tunkhannock Creek a large gravel deposit rises to a height of 125 feet above Susquehanna River and then spreads out into a wide plain. In the valley of the creek mentioned it takes the form of a sharp, low kame-like ridge of gravel and boulders. In such deposits the mastodon remains were found. According to White, these gravels and boulders were laid down in the waters which came from the retreating glacier and which deeply flooded all the streams. In case this explanation is the correct one, this mastodon lived there after the beginning of the retreat of the Wisconsin ice-sheet. Possibly, however, those gravels, at a height of 125 feet, belong to an older glacial stage. White, on page 123 of his report quoted above, referred to a tusk which had been dug up in one of the streets of Tunkhannock. This was probably the one mentioned in connection with the teeth. 2. _Pittston, Luzerne County._—Dr. Joseph Leidy, in 1873 (Ext. Vert. Fauna West. Terrs., p. 238, plate XXVIII, fig. 9), reported that there was in the Academy of Natural Sciences at Philadelphia 3 first premolars of apparently as many individuals of _Mammut americanum_, which had been found at Pittston, associated with _Equus major_ (_E. complicatus_) and _Symbos_ sp. indet. (“_Bison latifrons_” of Leidy). One of these he figured. The present writer has examined these teeth. Two are upper antepenultimate milk molars (pm^2), right and left; another is an upper penultimate milk molar, whose length is 45 mm. and whose width is nearly as much. They probably did not all belong to one individual. The geological age of these mastodons will be discussed on page 308. 3. _Berwick, Columbia County._—The U. S. National Museum has a cast of a mastodon tooth sent there in 1904 by Professor A. U. Lesher. The tooth was an upper right last molar and only slightly worn. There were 4 crests and a very strongly developed talon. No details were furnished regarding the conditions under which it was discovered. 4. _Reading, Berks County._—The collection of the Academy of Natural Sciences of Philadelphia contains a lower left hindermost tooth of a mastodon and some fragments of one or two other teeth, said to have been found on Schuylkill River at Reading. These remains appear not to have been accompanied by any details regarding the manner of their burial.