"Chocolate-band Snail" is the common name for "Eobania vermiculata".

Chiocciola chiocciola marinella  - Italian Children's Songs - Italy - Mama Lisa's World: Children's Songs and Rhymes from Around the World  - Intro Image

Thanks and Acknowledgements

This rhyme can be found in "Canti del popolo napoletano" collected and annotated by Luigi Molinaro del Chiaro (1880).

Image: Wikimedia Commons - Eobania vermiculata, cc.