Sea Anemones

A sea anemone is a polyp attached at the bottom to the surface beneath it by an adhesive foot, called a basal disc, with a column shaped body ending in an oral disc. Most are from 1.8 to 3 centimeters in diameter, but anemones as small as 4 millimetres or as large as nearly 2 metres are known.
There is a crab on the right side caught by the anemones.