You might remember this beautiful barnacle from 2016 or 2017. Paraconcavus pacificus reaches its northern limit in Northern California. I first wrote about this species in September 2016 (see the posts called "Unexpected plate appearance" and "P-pac, Part 2"), and I mentioned it again in February 2017 (see "Red-and-white revisited").
We found two of these barnacles washed up on the beach tonight (16 March 2018). We're still interested in other observations of this southern species, so let us know if you encounter any!