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Of another species of snail, Helix strigata, our learned author observes that "This shell is, when dead, one of those which is found on the banks of the Tiber. It is a strange circumstance that, although it is a land shell, it should be found more on the banks of a river than anywhere else, and also only on the banks of the Tiber, for it is not found on the banks of any other river.
Why are these little pebbles preferred to chips of lime-stone, when both materials are found in equal abundance around the nest? A yet more remarkable feature: we find pretty often, encrusted on the dome, a few tiny, empty snail-shells, bleached by the sun. The species usually selected by the Eumenes is one of the smaller Helices Helix strigata frequent on our parched slopes.
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