Fresh broken shell - about 4" long.
Mainly just pretty - possibly too worn to ID - but I liked how it had a pale turquoise glow. About 1" long.
About 5" long, intertidal.
"Generally 5 arms that are more slender than P. ochraceus’ and have a constricted appearance where they meet a smaller oral disc..."
ID as per: http://www.eeb.ucsc.edu/pacificrockyintertidal/data-products/sea-star-wasting/juvenile%20sea%20star%20identification%20guide_2015_0416.pdf
Spaghetti worm of some sort? Under rock - possibly dropped onto sand from hole above. Hard to say how long it would have been if extended, but the curled-up ball was about 1" long.