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.

In the second Figure is repre∣sented the Worm Two year old, in length 1⅔ of an Holland inch; the signs of its Wings or their Cases, wherein the Wings are inclosed, appearing; the two uppermost of them, much bigger than the two lowermost; it hath its Gills in a different manner turned over its back, than in the first figure, which I therefore note, for that all these Worms are re∣presented to the life, and withal to signifie how wonderful the mo∣tion is, which they without ceasing make with these constantly trem∣bling Gills.