This was produced by one of my new (old) hens that was free from kijiji... It's hard to see from the picture but it just looks like layers and layers of membranes with a few crunchy bits inside. I have not been able to find other pictures like it, to determine the cause. The previous owner said they were only 2 years old and had stopped laying a while ago, I think it is a nutrition problem but if you have any other ideas of what would have caused this, I would find it helpful as I am a new chicken owner. Just to note another of the "non-laying" hens produced a very thin shelled rough and spotted egg today, after being with me for about 1 and 1/2 weeks.