Spiralling in

 

Channeled Top Snail (Calliostoma canaliculatum), photographed along the Bodega Bay shoreline on 23 November 2015.

Here's a view from the side as the snail was crawling.  The tentacles and a small dark eye are visible on the right side.  You can also see the foot — speckled, with a fuzzy-looking texture.  And if you look closely, there's a partial view of the operculum ("trap door") — golden and circular (although only half is in view below the back edge of the shell).

 

Here's one more view — from below, when the snail was trying to right itself.

 

What a pretty foot!  And a beautiful snail.  I love the iridescence along the spirals.