LIBRARY

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EPHEMERIDA
FIG. drawing showing the internal anatomy of the naiad
of the long-tailed mayfly, Palingenia longicauda OUver, by Swammerdam as it ap·
peared in Bybel der Natuur in 1738. It was made with the aid of a small simple
lens. This large mayfly is COllUrl0ll to thf' lower portions of the Rhine and neighbor.
ing rivers in Europe.
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