Gastropods commonly called Snails.
This is a great example of a Silurian snail from the Rochester Shale formation.
Gastropods belong to the phylum Mollusca. The class of fossil Gastropoda in my collection is comprised of snails from saltwater. I have not yet found any freshwater snails in my travels.
Today snails can be found in salt and freshwater as well as on land.
Rochester Shale Formation
Middleport, New York