Three "seas"

We were doing field work on the Mendocino coast today (10 June 2016).  In between surveys, we documented a few nice invertebrates:

 

It might be tricky, but can you find three different species of echinoderms in the photo above?

There's a Purple Sea Urchin (Strongylocentrotus purpuratus).  Next to the urchin is a Six-armed Sea Star (Leptasterias sp.).  And just below the sea star, looking a bit like a brownish blob, is a sea cucumber — still to be identified...stay tuned!