Shell is boat-shaped Tiny “seat” inside shell
This animal protects its bare underside by attaching itself to a handy rock with its suction-cup foot. Often there are enough of them to give the rock a warted appearance.
The Spiny-skinned Animals (Echinoderms)
Starfishes (Asterias vulgaris, and others)
Five-armed body
The Starfish seems to like Oysters as well as we do, and it opens them by sheer strength. Oystermen used to tear Starfish apart to destroy them, until they discovered that each arm has the ability to regenerate and become a whole starfish!
Sea Urchin (Strongylocentrotus droehbachiensis)
Round body Covered with spines