A small arcorn, maybe three CM. There were about thirty more.
Acorn Barnacle, at low tide,at Discovery Park, in Seattle, WA
I wonder if thise are smaller barnacles that are attached to the larger barnacle?
I found David Jamison's web site EXPLORE PUGET SOUND HABITATS AND MARINE LIFE to be extremely useful in figuring identifications.
A nice beach walk with Mary Ellen while we had a -3.06 feet Low Tide
The limpet is the small white circular mollusk not the larger shelled one
Balanus glandula is one of the most common barnacle species on the Pacific coast of North America, distributed from the U.S. state of Alaska to Bahía de San Quintín near San Quintín, Baja California. It is commonly found in intertidal waters on mussels, rocks and pier pilings.