This appears to be the same anemone that was being attacked by the Aeolidia loui last week. Looks like it survived. Interesting 'scar' tissue forming on the side that was chomped. The nudibranch was still there, too, just resting next to its patch of anemones: http://www.inaturalist.org/observations/4438359
With popcorn shrimp.
San Diego County, California, US
Anthozoa is a class within the phylum Cnidaria. Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Instead, they release sperm and eggs that form a planula, which attaches to some substrate on which the cnidarian grows. Some anthozoans can also reproduce asexually through budding. More than 6,100 species have been described.