I received some live rock yesterday, strait from Florida waters. On the bottom (I think) of one of teh larger pieces are these 2 "nodules". They look like leathery human hearts, and are just a bit smaller than a fist. I thought at first that they were perhaps egg sacks of some shark, or some sort of Sea Prick that was all balled up. But, this morning I think I saw a hole open at one end of one. Perhaps they are some sort of giant Tunicate?
(Sorry no pix, the camera is down...)
(Sorry no pix, the camera is down...)