One of the coastal snail species I was able to find yesterday at a rocky beach on the western coast of Turkey near Çeşme was this Truncatella subcylindrica. As far as I know one species of Truncatella exists in the entire Mediterranean and it is this species. The range of the species extends all the way north to the southern coast of England.
It's not a very good picture, but you can see the snail's snout, 2 short tentacles and eyes as well as the yellow operculum at the top of the back of its foot. The shell of the snail is only about 4 mm long.