Can anyone ID this?

trainfever

Active Member
I took pics my my software is not responding and I cant get the pics from my camera. Anyway, I found this tube looking thing on a piece of Fiji rock. It is about 2 inches long, about3/8" in diameter stepping down to about 3/16" in diameter. There is an opening in the top which I have seen it close. The opening has a jagged top. Kind of pointy, if you can picture a crown? It's kind of a grayish brown and it is see through. I thought maybe it is a feather duster worm because there are two on this rock and both have been closed for the last couple days and then I saw one of them open yesterday. Anyone have any ideas from my description?
 
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