Aspect: Thin blue encrusting hard rubbery cushion with star-shaped network of veinous canals radiating from the excurrent openings. The "stars" are not connected. Population: Common. Notable feature: Generally blue as the caerulea (sky colour) in the latin scientific designation implies and ommited in the English designation, but pink variations not rare. Environment: Relatively flat surfaces, wreck hulls included, down to at least 25 metres. Behaviour: -
