It has not been practicable to arrange the figures on the map of mastodons in Florida in an orderly manner. Below, the localities are described by beginning at the northern end of the State and ending at the southern end. 1. _Marianna, Jackson County._—In the U. S. National Museum (No. 324) is a tooth of _Mammut americanum_, recorded as having been sent to the National Institute, September 25, 1847, by Walter Yonge, from Marianna. No additional information has been preserved. It is a large upper right last molar, with 5 cross-crests, a hinder talon, and nearly complete roots. Marianna is situated on Chipola River. 12. _Little River, Gadsden County._—Dr. E. H. Sellards (8th Ann. Rep. Florida Geol. Surv., 1916, p. 104) reported that a tooth of _Mammut americanum_ had been obtained from Little River. 2. _Fort White, Columbia County._—Dr. E. H. Sellards reported to the writer the discovery of a tooth of _Mammut americanum_ at a point 3 miles northwest of Fort White. No details have been received. The town is on Santa Fe River. 3. _Citra, Marion County._—In Ward’s Natural History Establishment, at Rochester, New York, the writer saw in January 1914, 2 cross-crests of a probably hindermost upper molar of _Mammut americanum_. There had been present a large pulp-cavity. Nothing definite about the history of the specimen could be obtained, except that it had been found at Citra. 15. _Neals, Alachua County._—From this locality Sellards (5th Ann. Rep. Florida Geol. Surv., p. 58) reported the discovery of a mastodon, probably _Gomphotherium floridanum_. Associated with this species was an undetermined species of _Hipparion_. At the same place has been found _Tapirus terrestris?_ On his plates IV and V of the same volume, Sellards has figured teeth belonging to two undetermined species of mastodons. All of these fossils came from the phosphate deposits at Neals. 16. _Archer, Alachua County._—Dr. Joseph Leidy (Proc. Acad. Nat. Sci. Phila., 1886, p. 11) reported that Dr. W. H. Dall had discovered at Archer remains of a mastodon to which Leidy gave the name _Mastodon floridanus_. It is here referred to the genus _Gomphotherium_. It was associated in the Alachua clays with a species of _Hipparion_, three species of _Procamelus_, and a rhinoceros; also an astragalus of _Megatherium_. All of these, except the last, are usually referred to the Lower Pliocene or the Upper Miocene. The writer believes that they belong to the lowest Pleistocene, the Nebraskan. 17. _Williston, Levy County._—Leidy (Proc. Acad. Nat. Sci. Phila., 1887, p. 309) reported the finding of several species of fossil vertebrates in the Mixon bone-bed, at or near Williston. The species were _Gomphotherium floridanum_, _Hipparion plicatile_, _Procamelus major_, and _Teleoceras proterus_. These were found in the Alachua clays at depths from 2.5 to 6 feet. In Dall’s list of 1892 (Bull. U. S. Geol. Surv. No. 84, p. 129) _Hipparion ingenuum_ is included.