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