Great Barrier Reef Oysters from The Great Barrier Reef of Australia 1893 by William Saville-Kent 1845-1908. Fig 1: Coral Rock Oyster Ostrea Mordax Fig 2: Cucullata Fig 3-4: Trap-door Oysters Ostrea Mordax Cornucopioeformis Fig 5: Cockscomb Oyster Ostrea IStockHistory com