Ogrc

this is what i mean about IDing the barnacle you need to see this bit http://www.comoxvalleynaturalist.bc.ca/assets/images/marine/common_acorn_barnacle.jpg

i think the two gastropods are different, the whorl of the larger is much more triangular like top shells where as the smaller is more rounded, not a littorina though i was wrong on that might just be becuase its a juvenile that its mishapen but i think they seem different, i have an id book so ill take a look! for barnicles if you can see inside there is usually a different patten on in the closing bit of shell, they are some sort of acorn barnacle though but there are several species.

There are a whole lot of animals in this phot, barnacles and two species of gastropod, the bigger blacker snail is a topshell, and the smaller looks to be a littorinid, for the barnicle you need to be able to see inside the cup to ID it properly.