My initial impression was that perhaps it was some sort of scale. I went and got my loupe to put in front of my camera lens to get a close-up of these creatures.
And this was my result. What kind of a creature was this? I have never seen anything like it. What is that line going down them. And on some of them there is what appears to be tentacles around a primitive type round mouth. Is my imagination running a little bit wild there?
Have a good day and if you have any ideas at all as to what these mysterious creatures might be please let me know in the comment section. I would appreciate it. Lew