|Wrinkled dogwinkle, Nucella lamellosa. (Probably) Stories Beach.|
These snails are extremely varied, both in colour and shape.
A most peculiar species because of its ability to vary so much in shape, color, and texture from one individuals to the next. ... It is one of the most common intertidal whelks in the Pacific Northwest. (From Wallawalla.edu)
A fan of this species, Dan Yoshimoto, has a page of shells found on both coasts of Vancouver Island, and on the mainland, from California to Oregon: over 200 shells, not counting the group photos at the bottom of the page, and so variable that it is difficult to believe they are all the same species. Go see.