1. _Perthshire, Bolivar County._—In the U. S. National Museum is a fragment, the rear end, of an upper left hindermost molar of _Mammut americanum_, received from Perthshire in August 1914. It is the gift of Mr. S. D. Knowlton and was reported as having been sucked up with gravel from the bed of Mississippi River. This place is in the northern part of Bolivar County and immediately south of latitude 34°. 2. _Caseilla, Tallahatchie County._—The writer has seen a lower left last molar of a mastodon, found in 1915, near this place. It was sent to the U. S. National Museum for identification by Dr. B. Franklin, of Caseilla. He stated that the tooth had been found in Avant Creek, about 3 miles above its entrance into Yalobusha River, apparently in the southeastern corner of Tallahatchie County, in township 23 north, range 7 west. The tooth had been buried in joint clay. The banks of the creek are usually about 10 feet high, but where the tooth was found, on the south side of the creek, the bluff is about 50 feet high. 3. _Jackson, Hinds County._—In the collection of the Academy of Natural Sciences of Philadelphia is a lower left last milk molar, presented by Dr. Isaac Lea and reported to have been found near Jackson, Mississippi. No additional information was furnished. The tooth is but slightly worn and has complete roots. 4. _Vicksburg, Warren County._—In the U. S. National Museum (No. 344) is a fragment of an upper right last molar, said to have been found at Vicksburg. The fragment consists of the hindermost crest and the talon. In Wailles’s report on the geology of Mississippi, 1854, page 284, there is a statement to the effect that mastodon remains had been found in the deep cut of the railroad at Vicksburg. 5. _Bovina?, Warren County._—In Wailles’s report, just cited, it is stated that mastodon bones had been found in the vicinity of Big Black River, near the eastern line of Warren County. While the statement is rather indefinite, the locality is probably somewhere in the region about Bovina, on the railway from Vicksburg to Jackson. 6. _Claiborne County._—According to Dr. Leidy (Proc. Acad. Nat. Sci. Phila., 1859, p. 111), portions of jaws with teeth of mastodons have been found in this county, associated with a skull of a bear which he could not distinguish from that of _Ursus americanus_. 7. _Jefferson County._—In Wailles’s report of 1854 (p. 284), already cited, it is stated that remains of the mastodon had been found in this county, near the former town of Greenville. The writer has not been able to learn more exactly where this town was situated.