Twenty-two new species of land snails are described from limestone hills on the west flank of the Mekong river delta, in Cambodia and Vietnam. The species belong to the families Assimineidae, Cyclophoridae, Diplommatinidae, Ariophantidae, Helicarionidae, Streptaxidae and Vertiginidae.
Diplommatinidae; formerly included in Pupinidae) are described from limestone hills on the east flank of the Mekong Delta, in Vietnam and Cambodia. A map showing the distribution of all ten species now known from the area is presented. In addition,
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