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Before us, beyond a little wall of a height to lean upon, on an isolated lawn, beneath the shade of great trees with interwoven boughs, a circular basin displays its still surface, across which the skating Hydrometra traces its wide circles.
They live as parasites on various water insects, such as Dytiscus, Nepa and Hydrometra, and when mature live free in the water, though Von Baer observed an adult Hydrachna concharum living parasitically on the gills of the fresh-water mussel, Anodon. The species are of minute size.
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