Angel Ledge, Midway Atoll, 80 feet

Fission, Pearl & Hermes Reef, 50 feet

Haleiwa Trench, Oahu, 60 feet

Kewalo Pipe, Oahu, 50 feet

Uncommon in rubble pockets on deeper reefs.  Circular with central hump, ribs of uniform height, bottom concave.  Often confused with the smaller Cycloseris vaughani.  Attains 4 inches.  Red Sea to Okinawa, Hawaii, and the Line Islands.  Formerly known as Fungia granulosa.

All coral skeletons illustrated are from scientific collections taken prior to 1998.