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Systematics is a study that is always changing. Since the publication of part one of this work there have been significant changes in the systematics and the higher classification of the Mollusca. The species under discussion now constitute a very varied assemblage. Representatives of 43 gastropod families are described, with a total of about 220 different species. Some groups present little or no identification problems. However, others can be very difficult to determine correctly, forming as they do a very homogeneous group. This applies most particularly to the Eulimidae. The various keys in this work are intended to facilitate these problems. In the descriptions, emphasis has been placed especially on shell features and characteristics which the authors feel are the most useful to distinguish between one species and another.
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