As I mentioned below, I recently had the idea that the stars with a tether in the Zodiac section might represent a comet’s path through the sign.
I think folio f68r2 shows the comet C/1490 Y1. It passed through Pisces in January of 1491, and its tail passed through Aries. There are 29 stars with tethers in the Pisces folio, along with 12 in Aries Dark and 4 in Aries Light.
I also think f67r1 shows a total solar eclipse in Pisces in 1485. In that case, if each nymph is 1° of the sign, the cans might indicate that the sun “covered up” the sign.
I uploaded to my MediaFire folder a file, Zodiac Section Nymph Overview, that lays out their characteristics.