50. _Attica, Wyoming County._—In 1887 (6th Ann. Rep. State Geologist, for 1886, p. 34), J. M. Clarke described briefly the finding of supposed mastodon bones at this place. A tusk had been encountered while a trench for a water-main was being dug on Genesee street. In 1888 (41st Ann. Rep. State Mus., for 1887, pp. 388–390, plate), Clarke reported the results of further digging. The tusk was exhumed, as well as two ribs and a fragment of the zygomatic arch. Nothing was found that distinguished the remains from those of an elephant. The fragments were in a bog-hole and scattered over a space about 20 by 25 feet. Under the made ground was first a layer of loam 5 inches thick, then came in succession 1 foot 2 inches of clayey muck and 1 foot 5 inches of unlaminated clay and an undetermined thickness of laminated clay. The bones lay in the unlaminated clay, at a depth of 2 feet 6 inches from the natural surface. With the bones was what was thought to be an ankle-bone of an elk. At a distance of 75 feet was another bog-hole, 75 feet in diameter, which was filled with muck lying on compact laminated clay. The muck had a maximum thickness of 4 feet. At the deepest place was found a piece of pottery and, beneath and around it, about 30 fragments of thoroughly burned charcoal. The proboscidean remains here described must have been buried after (how long after one can not say) the Wisconsin glacier had retired about two-thirds the way from its southward limit to the shore of Lake Ontario. 51. _Leroy, Genesee County._—J. E. De Kay, in 1842 (Zool. N. Y., Mamm., p. 104), stated that in 1841 a mastodon tooth weighing 2 pounds had been found in a bed of marl 3 miles south of Leroy. No other information appears to have been recorded. The mastodons found here and at Stafford and Batavia could have lived only after the ice-sheet had retired beyond these places. About this time the waters of the Finger Lake region found an outlet westward to the Mississippi by way of lakes Warren and Chicago. 52. _Stafford, Genesee County._—James Hall, in 1843 (Geol. 4th Dist., p. 364), reported that some years previously a small molar tooth had been found at this place. It was beneath muck and upon a deposit of clay and sand. There was found also a quantity of hair-like confervæ, of a dun-brown color, which resembled hair so closely that a close examination was necessary to determine its real nature. 53. _Batavia, Genesee County._—In 1904 (Bull. 69, New York State Museum, p. 932), Clarke reported for H. L. Ward, that in 1897 two tusks, a part of a skull with teeth, several vertebræ, and ribs had been found here. Nothing more is known about this case.