there is something growing on my turbo snail

Question
There is a small feathery creature that retreats into a tube on my turbo snail... I have pictures...any ideas?

Answer
IT IS A FEATHER DUSTER. A WORM WHICH BUILDS A LITTLE TUBE AND RETREATS FOR SAFETY. A NICE LITTLE BONUS AS THESE CREATURES ARE ABOUT $20.00. HARMLESS AND BEAUTIFUL. THE "FEATHERS" ARE APPENDAGES WHICH GATHER MINUTE PARTICLES OF FOOD FROM THE WATER. GERRY.