1. _Essex County._—In 1898 (Science, n. s., vol. VII, p. 80), Dr. H. M. Ami reported that he had exhumed some mastodon remains in this county. The exact locality was not given. It was north of the west end of Lake Erie. The section dug up was from 6 to 8 feet deep. At the bottom were clay and boulders; above this were found gravel and the bones, and above these sand, shell marl, peat, and other sands of various colors. The remains were fragmentary. 2. _Morpeth and Highgate, Elgin County._—In 1858 (Canad. Jour. Indust. Sci. Art, ser. 2, vol. III, p. 356), E. J. Chapman announced the discovery of a tooth of mastodon at or near this place. He had seen a drawing of the tooth. It appears that another man also had sent to the journal an account of the discovery, accompanied by drawings. These showed 5 distinct crown-ridges. In 1891 (Geol. Mag. London, ser. 3, vol. VIII, p. 504; Brit. Assoc. Adv. Sci., 64th meeting, 1892, p. 654), Professor J. Hoyes Panton gave an account of the discovery of mammoth and mastodon bones at Highgate, only a few miles north of Morpeth. These were found in a bed of marl. Some measurements of the mastodon were given. 3. _St. Thomas, Elgin County._—In a private museum at Niagara Falls, owned at the time by Davis Brothers, the writer saw a quite complete lower jaw and a tusk, labeled as having been found at this place in 1856, on the farm of Isaac Barnard. The jaw had the last 3 teeth on the right side and the last 2 on the left side. In front was a tusk about 6 inches long which appeared to be in the middle of the jaw. The upper tusk is curved in a semicircle. Dr. J. W. Dawson (Geol. Mag. London, ser. 1, vol. VI, 1869, p. 39) mentions this find. He stated that there were 2 lower tusks. If this was the case the species _M. progenium_ is indicated. 4. _London, Middlesex County._—In the article quoted above from the Geological Magazine of London, Dr. J. W. Dawson stated that there were in the Provincial Museum 3 mastodon molars which had been found at London. 5. _Marburg, Norfolk County._—In 1898 (Science, n. s., vol. VII, p. 80), Dr. H. M. Ami reported the exhumation of remains of a mastodon at some place in this county. The skull, 25 ribs, 40 foot-bones, 2 tusks, and many vertebræ were recovered. The remains were buried at a depth of from only 3 to 4.5 feet. At the bottom was clay; above this, shell marl, and sands of different colors; and above all was peat. The writer has seen this skull in Victoria Museum, Ottawa. It is to a considerable extent restored. It appears to have been found at or near Marburg. A small label, somewhat injured, has the record: “West half lot 15, R V, Tp. of [?]dhouse, Norfolk Co., Ont. Ami, 1897.” The penultimate and ultimate molars are in place. The former is 113 mm. long; the latter is 174 mm. long, and has 4 crests and a talon. The tusks are present and the right one is 2,230 mm. long. The skull is a large one. The width across the rear is 760 mm.