What is this? Goni poop?

[Enkopaaisen]

Just notice this afternoon. My goni was pooping as it usually dose every 3,4 days. But the right side of the frag got a funny spiral looking piece/ film. Anyone knows what it is?

 

[WalkerLovesTheOcean]

Definitely not from the goni. I have no idea what it is.

 

[Goaway]

Snails closing door.

Poor snail died and the door flew onto the goni.

 

[Goaway]

Took me a small search. It's called
operculum