What is this?

[seashells]

This looks like a closed anemone. It was a hitchhiker. Keep it or lose it?
http://www.seashellspoolandspa.com/nss-folder/pictures/anemone2.jpg

[muck]

http://www.canreef.com/photopost/data/500/1964anemone1.jpg

[muck]

Any chance of some pics that are a little bigger?

[seashells]

I increased the file size.

[Murminator]

http://www.canreef.com/photopost/data/500/1964anemone1.jpg