Anemones living in sand must have a tough existence: they are well camoflaged, but morsels are scarce and immersion by an underwater dune is always a worry.
Coonstripe shrimp are said to have compound eyes. Does that mean lots of tiny lenses with independent sensing elements? They seem expressive even so. This individual was at Blue Caverns, Catalina Island.
A sheep crab sits in eelgrass. Although they look somewhat like robotic Mars rovers, sheep crabs don't have a lot of personality. My impression is that they tend to be sour.
This clump of polyps, about 2 inches across, was attached to rock at Underwater Island, Anacapa. The eightfold arms identify the polyps as octocoral, apparently clavularrid.
Opalescent nudibranch with tiny tunicates, at Channels on the south side of Anacapa. The tunicates are about the size of the head of a pin. This is a small individual of this nudibranch species.
Giants come in different sizes. This giant spined star is still an infant. Even the adult giant spined stars seems smaller than the sunflower stars, though; but maybe I've never seen a fully adult giant spined star.