Ephemeri vita, or, The natural history and anatomy of the Ephemeron, a fly that lives but five hours written originally in Low-Dutch by Jo. Swammerdam ...
Swammerdam, Jan, 1637-1680., Tyson, Edward, 1650-1708.
Figure 2.

Representeth the Eggs of the Ephemeron, as the same appear to the naked sight without help of a Microscope, whereas all the other parts have been viewed and delineated by help of the Microscope.