FOUR original implements and casts of eleven others from the Oldoway beds in Tanganyika have been presented to the British Museum by Dr. L. S. B. Leakey on behalf of the East African Archæological Expedition, and are to be exhibited without delay at the top of the main staircase in the prehistoric section of the Department of British and Mediaeval Antiquities. They come from the following beds, beginning at the base: Bed No. 1, associated with Deinotherium, a predecessor of the elephant and generally assigned to the Miocene: pre-Chelles types. Bed No. 2, lower part, with Hipparion and Elephas antiquus: early Chelles types. Bed No. 2, upper part, the horizon of Prof. Reek's Oldoway man, with Hipparion, Elephas antiquus, and Hippopotamusgorgops: late Chelles types. Bed No. 3, with fauna as Bed No. 2: transition Chelles to St. Acheul. Bed No. 4, lower part, with Elephas antiquus, Hipparion, Hippopotamus gorgops, Pelorovis and extinct antelopes: early St. Acheul types. Bed No. 4, upper part, with same fauna as lower: advanced St. Acheul types.