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It's a beaded anemone, I can get the scientific name for you if you need it. They are great animals. They like to plant thier foot into holes in the live rock and aren't much for moving around like some other anemones. Great looking specimen too. What a great hitchhiker!!!
Just to add to Cindy's comments, I believe it to be Phymanthus (sand/rock anemone, but also referred to as "beaded") and have been known to surogate various clownfish. If it were Actinodendron, I doubt it, you'd definitely know by touch lol.