Apple Snail

Description:

This gigantic snail shell (empty when found), was deep brown, about 4" long from tip to its longest point. it had a deep umbilical hole, and the surface was worn and pitted.

Habitat:

It was spotted at the edge of a lagoon near the Amazon River.

Notes:

These are said to be edible, but undercooked can transfer some nasty organisms to your system. It is considered invasive, and has spread to the southern US states