In the Metropolitan Museum, New York, one of the works by Joris Hoefnagel is “Still life with flowers, a snail and insects”. This watercolour and gouache on vellum was made in 1589 . It is thus from his Vienna period .
The snail is seen from the side, its dextral shell uniformly greyish, as is the animal; only the two larger tentacles are shown. The shell might have been modeled after a Helix-like species.
 MMN, inv. 2008.110. Purchase, Charles and Jessie Price, Jean A. Bonna, and Annette de la Renta Gifts, and The Elisha Whittelsey Collection, The Elisha Whittelsey Fund, 2008. http://to.ly/FnaZ.