N. Reading

Department of Ear, Nose and Throat Surgery, Queen Alexandra Hospital, Portsmouth PO6 3LY, U.K.; Department of Ear, Nose and Throat Surgery, Whipps Cross Hospital, London E11 1NR, U.K.; Department of Radiology, Whipps Cross Hospital, London E11 1NR, U.K. and Human Origins Group, Department of Palaeontology, The Natural History Museum, London SW7 5BD, U.K.