It was only in the middle of the Atlantean epoch that the true human form appeared. In the previous epoch, and indeed at a very early period, the external form of man was very mobile; not only could he move his limbs as at present, but through inner powers he could elongate or shorten them, etc. To the ordinary consciousness of today it seems a kind of outrage to say such things about past conditions of the earth and of man. Even here among Anthroposophists you may have observed that we endeavour to develop certain truths step by step; we give them forth gradually, in small doses — they are then more easily digested.
Source: Rudolf Steiner – GA 105 – Universe, Earth and Man: VII – Stuttgart, 11th August 1908