Gastropod
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Gastropods are a vast and diverse group of invertebrates within the phylum Mollusca, comprising the animals commonly known as snails and slugs. With an estimated 65,000 to 80,000 living species, they
Cepaea nemoralis: a European pulmonate land snail, which has been introduced to many other countries
The shell of Zonitoides nitidus, a small land snail, has dextral coiling, which is typical (but not universal) of gastropod shells.
The shell of Physella acuta, a freshwater snail, which is left-coiling (sinistral).
Slug
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Slug or land slug is a common name for any apparently shell-less terrestrial gastropod mollusc. The word slug is also often used as part of the common name of any gastropod mollusc that has no shell,
An active Ambigolimax slug in Fremont, California
Deroceras juvenile with eggs of another (larger) slug species, most likely Arionidae
Pair of mating Leopard slugs (Limax maximus), suspended by mucous thread and pad on wall