Looks to me like a Tunicate!
http://www.abovebelowphotos.com/gall...um09/Tunicates
iy
"KurtG" wrote in message
...

http://www.serent.net/the-thing.jpg

The picture isn't too hot, but I have a few of these growing on rocks.
They seem to have a circular orifice at the top and a rubbery feel to
them.

--Kurt