besides they are fuzzy pictures, I looking to see if anyone can tell me what the three things are in the picture. I'm guessing yellow sponge?, tiny feather duster and the one I really want to know, no clue.
Nothing in the pic moves around?
About the bottom pic... it appears to have some type of appendages.
Are they immobile or fleshy? Do they retract ?
If the appendages do not retract I am thinking Jewel Box category?
I belive that the thing that you "really wanted to know about" is a common hitchiker clam. They are harmless filterfeeders that will extend their feeding tube if left alone for long enough.