of animals, as affected by changes of vegetation, 43
of animals, as affected by organic changes, 44
of animals, hypothetical illustration of, 46
of animals, complexity of the causes affecting the, 49
of animals, problems in, 51
of plants, as affected by the glacial epoch, 42
Dodo of Mauritius, 282
Dolichopterus, European Miocene, 162
Dommina, N. American Tertiary, 134
Dorcatherium, European Miocene, 120