Dear Susan,

I've photographed an invertebrate entering the house where I live. And put the photo on http://en.wikipedia.org/wiki/Terricola

It's a worm, not a mollusc. Please let me know if you or any of your invertebrate colleages would be interested in writing an article on this flatworm. 

The Blue Planarian (Caenoplana coerulea) came knocking on the door, wishing to get inside. That's one invitation you can't refuse. 

kind wishes, PETE