The French book where I found this vintage snail drawing labeled this as the shell of a ampullaria virescens. Best I can tell, this is a drawing of an apple snail shell. Apple snails are often kept as pets in fresh-water aquariums.
The apple snail shell is colored mostly brown but it has splashes of green and the tip appears to be slightly pink. I think it would be a wonderful addition to a mixed media art project with such lovely colors.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.
