Redescriptions and relationship of Siphonaria zelandica Quoy and Gaimard to S. australis Quoy & Gaimard with a description of S. propria sp. nov. (Mollusca: Pulmonata: Siphonariidae). Journal of the Malacological Society of Australia, 6(1-2) 1983: 1-35. 23 [Zoological Record Volume 120]