Here's a more general fact sheet about the snails. They are native to western Europe but they're found all over the world. http://idtools.org/id/mollusc/factsheet.php?name=Oxychilus%20spp.
Yes, the picture I sent is from an Australian site, but tha genus is found in Europe, North America (in my yard in California), and Australia too. I only included the picture so you could compare the shell shape and height.
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