What is this crab?

[T. Schutt]

We have gotten some flame scallops in our tank and one of them had a hitchhiker inside of it. It seems to be an albino, and more or less clear. It's pretty big, almost the size of the scallop it was inside of. Can anyone identify it? I have searched absolutely everywhere and found nothing about it.

 

[JohnVH]

Looks like it could possibly be an Anenome crab its hard to say from the picture at that angle. Is it upside down?