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"Of Physa and Lymnaea, it is extremely doubtful whether there are any species throughout the province more than we have in Britain.
The last irruption of salt water happened in 1824, when the North Sea entered, killing all the fresh-water shells, fish, and plants; and from that time to the present, the sea-weed Fucus vesiculosus, together with oysters and other marine mollusca, have succeeded the Cyclas, Lymnaea, Paludina, and Charae.
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