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Covers naturalised land gastropods comprising a total of 29 species representing 11 stylommatophoran families. All species are described and illustrated, with new or corrected anatomical data. The systematic status of each species is discussed, and information on their distribution, history in New Zealand, and biology is presented. A key to identification is included, and methods for collection, preparation, and curation are briefly outlined. The author has also provided comprehensive descriptions and discussions of the body plan and organ systems in Stylommatophora, which are important in systematics and taxon recognition. Most species are illustrated from life in a series of colour plates.