PULMONATA
Pulmonata
The Pulmonata, or "pulmonates", are an informal group of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includes many land and freshwater families, and several marine families.The above text is a snippet from Wikipedia: Pulmonata
and as such is available under the Creative Commons Attribution/Share-Alike License.