|Image: John Turnbull|
|Image: Donna Pomeroy|
|Image: Yin Keen Chan|
|Image: BIO Photography Group, Biodiversity Institute of Ontario|
The funnel sprouts out of the worm's head and is used to catch food. If something altogether too big comes along and casts its shadow over the funnel, the worm is swift to disappear into its burrow.
Video: Patrick Anders Webster
And as it does so, you might notice a noisome wobble as it escapes to safety. This at last is the slime, for Slime Fan Worms live in an underground tube made out of soft, transparent mucus-type stuff. It typically gets covered in sand so that it loses its transparency, but it always has that faintly disgusting wobble.
This is also where they get their genus name from. Myxicola means something like "living in slime". Nevertheless if someone decided to make Myxi Cola, I'd try it.