Transactions of the Royal Society of New Zealand Volume 84 Published by the Royal Society of New Zealand, Victoria University College, P.O. Box 196, Wellington, W.I., New Zealand Editor: J. T. Salmon, D.Sc., F.R.S.N.Z., F.R.E.S Associate Editor: C. A. Cotton, D.Sc., Hon. LL.D., A.O.S.M., F.G.S., F.R.S.N.Z. Part 1 (Pages 1–200) Issued October, 1956 Part 2 (Pages 201–466) Issued December, 1956 Part 3 (Pages 467–642) Issued April, 1957. Part 4 (Pages 643–986) Issued August, 1957 London Agent: High Commissioner for New Zealand, 415 Strand, London, W.C.2 Printed by Otago Daily Times and Witness Newspapers Co., Ltd. Dunedin, New Zealand