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Limnæa auricularia is particularly suitable for deep waters, and L. pereger, whose shell is of type 2, is a most valuable addition to the food supply in any fish pond. It is one of the commonest of our fresh-water snails. There are a great many different kinds, and the larger ones should, as a rule, be avoided. Sphæriidæ and Pisidia are probably the best.
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