From Star Maker, Olaf Stapledon, 1937:
One very common kind of quasi-human world I must describe in more detail, as it plays an important part in the history of our galaxy. In these worlds man, though varying greatly in form and fortune in particular worlds, had in every case developed from a sort of five-pronged marine animal, rather like a star-fish. This creature would in time specialize one prong for perceiving, four for locomotion. Later it would develop lungs, a complex digestive apparatus, and a well-integrated nervous system. Later still the perceiving limb would produce a brain, the others becoming adapted for running and climbing. The soft spines which covered the body of the ancestral star-fish often developed into a kind of spiky fur. In due season there would arise an erect, intelligent biped equipped with eyes, nostrils, ears, taste-organs, and sometimes organs of electric perception. Save for the grotesqueness of their faces, and the fact that the mouth was generally upon the belly, these creatures were remarkably human.