The small and medium sized snails of the Helicidae family come in many different colours. Because of their sometimes present characteristic bands those snails are also referred to as banded snails. Their richness in colours and patterns is astounding even for gastropods, taking into account that there are many colourful species of marine gastropods or sea shells.
In Central Europe there are four species of the genus Cepaea (Held 1838). Of those two are generally very well known: The larger grove snail or black mouthed banded snail, Cepaea nemoralis, and the smaller garden banded snail or white mouthed banded snail, Cepaea hortensis. Both are different in size (though a small nemoralis may be as big as a large hortensis) and the colour of their apertural lip.
Reference: http://www.molluscs.at/gastropoda/terrestrial/banded_snails.html