A pair of babes

I explored a new area on the beach at low tide, and found many tiny starfish, mostly mottled stars, all looking healthy.

Here's one:

Star, Evasterias troschelli, with my fingertip and a baby sea urchin. I don't know what the brown circle is.

I have small fingers; that fingernail is 1/2 inch across at the widest point, which makes the baby star just under an inch, arm tip to arm tip, and the urchin about 1/8 of an inch, not counting the spines.