Little trumpet -- Part 2

Okay, so here's the mystery photo from last night:

 

And here's a zoomed out view showing more of the animal:

 

Yes!  This is a serpulid tubeworm (Serpula columbiana).  And the little "trumpet" is an opercular plug.  That is, when the worm retracts into its tube, the operculum seals the opening, protecting the worm inside. (Interesting side note: The operculum is a modified radiole — the radioles are the tentacles that form the feathery crown of the tubeworm.)

I didn't get a picture of this particular worm when it was retracted.  However, here's a different individual from 2012 (below).  In this case, the worm is entirely withdrawn into its tube and you can only see the operculum:

 

[In case anyone is wondering, there is a dark purple sponge growing around the worm's tube.  These serpulid worms live in calcareous tubes, which are usually white, but in this case the tube itself is hidden by the sponge.]