What is this worm?

[ChiTownRomeo]

Was moving a rock and came across this worm. I'm sure it's not a bristle worm cause I don't see any bristles. Plus this worm has a funny mouth,

Unidentified Worm In Reef - YouTube

 

[Ingy]

Kinda looks like it might be a peanut worm

 

[Amitas]

Almost looks like a bobbit, however I cannot see the mouth to well for a definite identification, however I would not put it back in just to be safe.

 

[bribo12]

Medusa worm, almost 100% positive. The feathery appendages coming out of its mouth sift the sand.