The development of the vertebrate skull / Gavin de Beer. De Beer, Gavin. Sir, 1899-1972. Skull. Vertebrates Development. Vertebrates Embryology. QL821 .D35 1971 596 DED "First published 1937." include index and Bibliography: p. (517-5480. Oxford : Clarendon Press, c1937. c1937. 1971 Text xxiv, 552 p. : eng