Its the circled part that looks kind of funny to me. Kind of webby looking.
Walter, for fear of sounding rude, is that the large hole or the small one?? You know how one end of the clam has a small hole that protrudes upwards like a tube (I think thats the exhalant siphon), and the other has a larger oval shaped hole (inhalant siphon) where you can see the clam bits inside??
I'm thinking its sucked up that green thing. Or is the green thing part of the tissue??