In the collection of the Rijksmuseum Amsterdam, this engraving was made by the German printmaker Heinrich Aldegraver (1502–ca. 1561). It is dated 1550. The description says a decoration with a bat in the middle of a snail and insect on the wing, including a weapon trophy in a [sea] shell below. Also stemming from the shell are two leafs, ending in a male and female satyr, each one with a winged herm on their heads .
The snail has a shell with incrementally widening whorls and a very large aperture. The animal has two tantacles and an eye-spot at the base; its foot is folded as if modelled after a live specimen. The engraving technique has made this specimen a sinistral one.
 RMA, inv. RP-P-OB-2916. Permalink: http://hdl.handle.net/10934/RM0001.COLLECT.322651