Small tubeworm-like invert ID

[bromion]

Can anyone help me ID these small tubeworm-looking inverts? They are brown, few millimeters in length, and have a white protrusion at their tips. I am guessing it's a gastropod, but not sure. Here are the pics:

http://flickr.com/photos/bromion/209800879/in/photostream/
http://flickr.com/photos/bromion/209800878/in/photostream/

 

[kmk2307]

I agree that it is probably a gastropod. Try looking up the family Vermetidae.

HTH,
Kevin