3. _Port Kennedy, Montgomery County._—As long ago as 1871 (Amer. Jour. Sci., ser. 3, vol. I, pp. 235, 384), Wheatley announced the discovery of 2 unidentified species of horses in the great bone cave at the place named. They were associated with the remains of 40 other species of vertebrates, besides many insects. In 1899 (Jour. Acad. Nat. Sci., Phila., ser. 2, vol. II, pp. 193–267, plates XVIII-XXI), Cope described the materials collected up to that time from the same cave. Of horses he recorded 2 forms, which he named _Equus fraternus fraternus_ and _E. fraternus pectinatus_. He was inclined to believe the latter would prove to be a distinct species. It is not certain whether this conclusion was correct; but if not a species, it is probably a subspecies of _Equus complicatus_. The teeth referred to _E. fraternus fraternus_ are pretty certainly those of _E. complicatus_. Of this species Cope had a decayed skull of a young animal with teeth, besides a considerable number of other teeth and some bones of the skeleton. The geological relations of these remains and those of the other species will be discussed on pages 311 to 320. 4. _Rutherford, Dauphin County._—In 1868 (Proc. Acad. Nat. Sci., 1868, p. 195), Leidy described a horse-tooth, loaned him by Mr. W. Lorenz and found somewhere between Rutherford and Highspire. It was met in a depression 6 feet deep and 20 feet across, filled with diluvium. Leidy thought the tooth might have belonged to a contemporary of the mastodon, but this was equally improbable. All the cement was dissolved from the tooth, and the latter was stained by iron, but not petrified. It was an upper second true molar. It has probably suffered the fate of such specimens as are retained in private hands. 5. _Frankstown, Blair County._—From Mr. O. A. Peterson, of the Carnegie Museum, Pittsburgh, the writer learns that some part of an unidentified species of horse has been found in the collection made some years ago at Frankstown. For a list of the species page 321 may be consulted. OHIO. (Maps 17, 36.) 1. _Cincinnati, Hamilton County._—In 1895 (Jour. Cin. Soc. Nat. Hist., vol. XVII, p. 217), Mr. Seth Hayes recorded the discovery of a molar tooth and a vertebra of a horse, identified as _Equus fraternus_. It was met with in exhuming the remains of the “Shaw mastodon” in Hyde Park, in the northeastern part of Cincinnati. The details of the exhumation are given in the description of the mastodon. The geological age of these animals dates probably from about the Sangamon stage. The writer has not been able to examine the horse remains referred to. It is probable that the tooth belonged to _Equus complicatus_.