Wiktionary
grove snail
n. (taxlink Cepaea nemoralis species), one of the most common species of landsnail in Europe, with a dark brown lip to its shell.
Wikipedia
Grove snail
The grove snail or brown-lipped snail (Cepaea nemoralis) is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc. It is one of the most common species of land snail in Europe, and has been introduced to North America.
Cepaea nemoralis is the type species of the genus Cepaea. It is used as a model organism in citizen science projects.