Pulmonates which frequent the sea-coast (Oncidium, fig.
The Oncidiidae are entitled to the name "sea-slugs," as they are shell-less Pulmonates living on the seashore, though not actually in the sea.
But there are a considerable number of snails, both terrestrial and aquatic, which are not Pulmonates.
The fresh-water snails which are not Pulmonates are the Paludinidae, Valvatidae and Ampullaridae, together with Neritina, a genus of the Neritidae.
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