About a week ago one of my 2 hens "laid" an egg with no shell. Actually there was one "egg" including a yolk and the egg-white inside of a membrane - no shell at all, and another just egg-white inside a membrane with no yolk, and again no shell at all. There were right next to each other. Since then she has not laid another egg at all. I already give them oyster shells, so I'm not so much worried about the shell-less egg, I figure it is an anomaly. What does worry me is that she hasn't laid another egg since then.