Identificaciones de austinsmith

I can only think these shapes on the rocks are the remains of barnacles that have been eaten by some other creatures (barnacle-eating dorids?).

Big clump of barnacle, brown and about a foot high

Many different shapes. Some of them remind me of seashells. Found on the side of a wall. They were visible because of the water draining. Many different shades of white grey and beige

Growing on metal ladder
Found on a dock

They are barnacles. They look like shells either moss or sea grass on them. They grow on things in the ocean.