Oriental Region, definition of, [44]
mammals and birds of, [44]
reptiles of, [45]
insects of, [45]
Origin of new species, [56], [60]
of new genera, [61]
of the Galapagos flora, [288]
of the beetles of St. Helena, [298]
of Australian element in the New Zealand flora, [498]
Orkney, peculiar fishes of, [341]