Gray Moon Sponge – Spheciospongia confoederata
Scuba San Diego Inc guided dives into the La Jolla Cove ecological reserves feature these very large sponges. They can be 12 (30 cm.) inches thick and 4 feet (100 centimeters) long. They are petty plentiful on the outer reef rock pile about 400 yards (400 meters) on a heading of 50o from the Life Guard shack. They are grey and leathery. There are crater-like oscula on their outer edge.
They can be found from Central California to Baja California for the near shore intertidal zone to depths of 100 ft (30 cm.)