Song To The Sea

I've spent my weekend at a marine research centra with my biology class, so we'll take a break from Paris and just work through the photos I took there. First I think it is a Antedon Petasus, the teacher just called it Feather Star (Hårstjärna). Then there is some barnacles (Semibalanus balanoides or Balanus improvisus) most likely, and next to them a periwinkle (Littorina saxatilis or Littorina littorea). And last, but not least, a sunset.