Ormuzd, [265]
Ornithology, [136]
Ornithorhynchus, [156]
Ornithoscelida, [69]
Orohippus, [77]
Orthodoxy, [246]
Owen, Sir Richard, [65], [66], [115], [118]-[121], [131], [133], [136], [145], [146], [162]
Oxford, [120], [125], [263], [264]
Oxford, Bishop of, see Wilberforce