While one can not at present be certain that this animal did not live up to a late stage of the Pleistocene, it is improbable that it did so. It is also quite improbable that the megatherium and walrus lived at Long Branch at the same time. It is more likely that the megatherium had its existence there at the time when horses lived in the same region and when the Port Kennedy fauna existed; that is, at some time during the early Pleistocene about the Aftonian stage.
1. _Port Kennedy, Montgomery County._—From the noted bone cave at Port Kennedy a number of species of _Megalonyx_ have been described. The presence of this genus was first announced by Wheatley (Amer. Jour. Sci., ser. 3, vol. I, p. 384). Cope, in 1899 (Jour. Acad. Nat. Sci., Phila., vol. XI, pp. 211–219), admitted the occurrence of 4 species, _Megalonyx wheatleyi_, _M. loxodon_, _M. tortulus_, and _M. scalper_. It must be left to future investigations to determine the status of these species. _M. jeffersonii_ was not recognized by Cope in the materials found in the cave. Of _M. loxodon_, only a single upper canine molar was found. Of _M. wheatleyi_, numerous specimens were secured, including considerable parts of crushed and decayed skulls. _M. tortulus_ was represented by a considerable number of teeth; _M. scalper_ by only a single “canine-molar.” On page 312 will be found a list of the species of vertebrates associated with these sloths. Of _Mylodon_, Wheatley (op. cit., p. 384) had a single ungual phalanx which Cope (op. cit., p. 210) thought belonged probably to _M. harlani_.
2. _Frankstown, Blair County._—Remains of an undetermined species of _Megalonyx_ have been reported from a bone cave at this place by Dr. W. J. Holland (Ann. Carnegie Mus., vol. IV, 1908, p. 231). The associated species are listed on pages 321–322.
1. _North Fairfield, Huron County._—In the Norwalk, Huron County, Museum there are various bones of _Megalonyx jeffersonii_ which were obtained about 7 miles from North Fairfield. The writer learned of the discovery of this skeleton from Mr. Roe Niver, a student of the University of Illinois. Unfortunately Mr. Niver died before the writer could obtain all the desired information. A part of the skeleton was in his possession and is probably in the possession of his family, but the writer has been unable to secure any information from them. The bones were found at a depth of a few feet in a hackberry swamp and were considerably scattered. In the search for these the bones which form the type of _Bison sylvestris_ Hay were found. The locality is within the area of the Wisconsin drift-sheet and evidently the animal lived there after the ice had retired from the region.