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The carnivorous snails have tongues that are covered with thousands of tiny teeth to tear apart food. The gastropod fossils from Jacksboro, TX shown below are from the Pennsylvanian, Finis formation, and these gastropods lived about 300 million years ago.
Some species, such as native slugs, have soft, jelly-like eggs, while flax snails and kauri snails have eggs with a hard, calcified shell. The eggs can be quite large - up to about 13 mm in diameter in giant snails. The eggs develop for some time; the young snail and slug hatchlings resemble adults.