In the British Museum collection this drawing represents a “sard gem engraved with a griffin leaping on a lion, and a snail in front of the lion’s nose (BM Cat. Gem 1852).” . The drawing in pen and ink with grey wash and traces of graphite underdrawing was made by Charles Townley and dates from his active period (1768–1805). It was used for the carving of a cameo.
The snail is stylised and the animal has two tentacles only. Its coiling direction is unclear.
 BML, inv. GRA 2010.5006.576. http://to.ly/EuSd.