ABSTRACT
East Africa has contributed very greatly to our knowledge of fossil members of the Hominoidea. These come from deposits ranging from the Lower Miocene through the Lower Pliocene and the Villafranchian to the Middle Pleistocene, as well as from the Upper Pleistocene. It seems to me that if these finds are to be fitted, adequately, into the picture of the evolution of the Hominoidea, a certain amount of revision of some of our earlier ideas becomes an urgent necessity.
