Hermissenda crassicornis, opalescent nudibranch (rendered in chalk)
All photos in this post taken by me back in 2007!
Clown nudibranch, Triopha catalinaeJanolus fuscus (not an opalescent nudibranch, despite looking kind of similar)Diaulula sandiegensis, as best I can tellFlabellina trilineataSome kind of sea lemon (there are two local species and I was shooting from about 4 feet away… no idea which one this was)
And some more on Sea Slug Day! It’s Terry Gosliner’s birthday.