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ABSTRACT
The climogram and conditions of activity of two species (Trochoidea (X.) seetzeni and Sphincterochila boissieri) of desert snails are described. Data on their reproduction are given: number of eggs in a clutch, length of incubation in field and laboratory, percentage of hatching, and certain morphological and chemical characteristics of the eggs. Some data on growth rate and duration of life are discussed, in comparison with data on other Pulmonate snails.