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This topic has been raised a number of times in iSpot observations so this post may be of wider interest.
Identification of terrestrial juvenile snail shells is important for ecological, archaeological and pleistocene geological studies.
It is fortunate that the whole development of a snail shell remains visible in the adult. To know what a juvenile snail shell looks like you only need to examine larger immature or adult specimens.
The embryonic whorl (the shell possessed when the snail emerged from the egg) is particularly important in this regard. Note the size, shape and texture. It may not be so easy from photographs, but with a suitable reference collection and a stereomicroscope much is possible and the difficulties are well documented.
A good starting point is the work by John G. Evans Land snails in archaeology; with special reference to the British Isles. London, New York, Seminar Press, 1972. xii, 436 p. illus. 24 cm. ISBN: 0128295503