Red Sea Cucumber
Red Sea Cucumber, Cucumaria miniata to it's friends. These things are quite mobile - the bright red arms filter out food bits and then pull them inside to be consumed.
Big And Little Anemones
From what I understand, adjacent Anemones are probably clones - they would sting each other if they weren't the same animal. The purple ends are the stinging areas. Anthopleura elegantissima.
Two Types Of Chitons
The Larger Chiton is a Black Katy Chiton - Katharina tunicata. They were very common on in the mid and low tide regions. The smaller Chiton is a Lined Chiton - Tonicella lineata, and is apparently eaten by ochre stars.
