Yay for comparison! This one clearly shows the arched, unzigzagged lines on the head valve that distinguish it from Tonicella lokii.
Today I specifically set out to pay attention to things I often pass over (foolishly) in my quest for slugs. This chiton is one I learned from Ron Wolf's photos. Previously, I would have just called it a Lined Chiton and moved on, but the zigzag stripes on the "head" valve distinguish this one. Anything named after the Norse god of deception deserves recognition.
This is a very small sea cucumber that I occasionally encounter while tidepooling. Looks a bit like Rostanga from a distance, but when you get close you see it ain't no slug.
Yet Another Blurry Rostanga. Not too much slug action out there today, just this guy, an uncooperative Acanthodoris lutea, and a Doris montereyensis that turned out even worse than this.