Hey @royaleagle, I like your mystery post about this strange egg sack. I have no idea what creature's eggs they might be. In fact, at first it seemed like a piece of snakeskin to me.
So I shared it as part of my weekly curation post Look What I Found and @pifc's Pay It Forward Curation Contest. Here you can take a look at it: https://steempeak.com/@stortebeker/look-what-i-found-on-marlians
I thought it was something like a snakeskin but as I looked at it closer the circle didn't have a beginning or end. So my next guess was eggsac.