Orthonyx not a New Zealand genus, [483]
Osprey, wide range of, [15]
Ostriches, limitation of, [30]
Otter-like mammal in New Zealand, [475]
Overlapping and discontinuous areas, [28]
P.
Pachyglossa aureolimbata, in Celebes, [463]
Palæarctic Region, limits of, [39]
characteristic features of, [41]
Palæozoic formations, depth of, round London, [218]