Yesterday diving at Rachel Carson Salt Pond off the Pemaquid Peninsula in Maine, we were at about 35 feet along a series of ledges or steps. Lots of marine life around us. Hanging off a large boulder was this bag-like grey mottled thing about the size of my fist slowly moving back and forth in the water. My first thought was that it was a Golden Star Tunicate (Botryllus schlosseri) since it had similar pattern and coloring but I had never seen one as a bag loosely hanging, I usually see them spread along coating a rock. Do they become bag-like too or is this something else?
