Notes on the Distribution of Sex and Shell Characters in Some Australian Populations of Potamopyrgus (Gastropoda: Hydrobiidae)

Summary Figures are presented for the proportions of the sexes and shell types in collections of the fresh water prosobranch Potamopyrgus from area of Australia. Findings are compared with those from populations in New Zealand. N.B. Representative material from these collections has been deposited in the Australian Museum, Sydney, and from the Victorian localities, also in the National Museum of Victoria, Melbourne.