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Abstract
THE results of a three-year survey of the occurrence of the family Lymnaeidae (Mollusca Gastropoda) in New Zealand freshwaters are presented, together with some ecological observations. It has been shown that Lymnaea columella, until recently not known to be present in this country, is widespread. The economic significance of this is discussed in relation to its role as an intermediate host of the common liver fluke, Fasciola hepatica.