What did my hen ‘lay’ ?

[Correiacluckers]

Whhhhaaaattt is this I found in my nesting box this morning??

 

[nuthatched]

That looks like a severe lash 'egg'. Do you know which one?

 

[Sc_chickengirl]

Whhhhaaaattt is this I found in my nesting box this morning??

that's scary!

 

[Eggcessive]

It is probably a lash egg, a product of salpingitis or inflammation of the oviduct. Antibiotics may or may not be helpful, but the earlier the better the chances.

Is that a round worm also in the picture? Does it come apart from the lash material?

Here is some reading about salpingitis:
https://the-chicken-chick.com/salpingitis-lash-eggs-in-backyard/