Sharkfin, Lanai, 25 feet

Parasitic snail w/eggs on underside, Kaneohe Bay, Oahu, 3 feet

Moku o Loe, Kaneohe Bay, Oahu, 2 feet

Makapu'u, Oahu, 25 feet

Puako, Hawaii, 20 feet

Makua, Oahu, 25 feet

Common in depressions on shallow reefs.  Generally oblong and thick with sinuous ribs of varying length.  Tentacles may be green when extended.  The parasitic snail Epifungium ulu may be found on the underside.  Attains 7 inches.  Hawaii & the Indo-Pacific.

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