2. _Bogue Chitto, Dallas County._—In the U. S. National Museum is an upper right true molar, first or second, of a horse, found at this place in 1883, by L. C. Johnson, of the U. S. Geological Survey. The tooth is identified as that of _Equus leidyi_. The enamel is much crenated. At the same place was found a tooth (a lower molar) of _Elephas imperator_, and teeth of _Mammut americanum_. It seems to the writer that the presence of these species indicates that the deposits along Bogue Chitto belong to the early part of the Pleistocene, about equivalent to the Aftonian. MISSISSIPPI. (Map 17.) 1. _Orizaba, Tippah County._—In the U. S. National Museum (No. 1907) is a fossil tooth of a horse, a third or fourth right premolar, found apparently not far from this little town. It is labeled as having been picked up at Lander’s mill, 9 miles south of Ripley, on Cane Creek, out of débris of Cretaceous marl, and given to Dr. T. E. Stanton. How it came to be mingled with the marl is not known. The tooth is only moderately worn, the height being 75 mm. The length of the grinding-surface is 28 mm., the width 27 mm. It has the enamel unusually strongly folded. The tooth is referred provisionally to _Equus leidyi_. 2. _Natchez, Adams County._—Elsewhere will be found an account of the discovery of fossil vertebrates near Natchez by Dr. M. W. Dickerson (p. 390), among which were found horse-teeth, referred to two species. One of these horses, represented, as supposed, by 12 teeth, was at first called by Leidy _Equus americanus_ (Proc. Acad. Nat. Sci. Phila., 1847, vol. III, p. 265, plate II); but later _Equus complicatus_ (Proc. cit., 1858, p. 11). In 1901 (Bull. Amer. Mus. Nat. Hist., vol. XIV, p. 109, fig. 7), Gidley selected one of the teeth, that of Leidy’s plate II, figs. 1, 6, referred to above, as the special type of the species _Equus complicatus_. These Natchez teeth are now in the collection of the Philadelphia Academy of Natural Sciences. Some of the teeth from Natchez were described by Leidy in 1860 (Holmes’s Post-Pliocene Fossils of South Carolina, pp. 100–105, plate XV, figs. 11–15, plate XVI, figs. 24–26, 30, 31) as _Equus complicatus_. Others (pp. 100105, plate XV, figs. 17, 18, plate XVI, fig. 27) were referred to a hitherto unrecognized species _Equus fraternus_. TENNESSEE. (Map 17. Figure 23.) 1. _Rogersville, Hawkins County._—In the U. S. National Museum (No. 520) is a single horse-tooth found many years ago in a crevice in a marble quarry at this place. It is referred by the writer to _Equus leidyi_ (Proc. U. S. Nat. Mus., vol. LVIII, p. 84). With it were sent a canine tooth and a few bones of a peccary, described as _Mylohyus setiger_ (p. 394).