Feeding on what I think is heart-leaf willow (Salix eriocephala?) leaves along with red-spotted purple caterpillars (not pictured).
@ipat this was what I thought was a dead/cast lyre crab but when I got home I think it might be a pyctogonid it was really small, less than 0.5cm across
Found on an intertidal explore with Hillsborough Elementary School.