Aphanapteryx of Mauritius, 164
Aphelotherium, European Eocene, 125
Aquila, European Miocene, 161
Archæopteryx, Bavarian Oolite, 163
Arctic zone not a separate region, 68
Arctocyon, European Eocene, 125
Arctodus, N. American Post-Pliocene, 130
Arctomys, European Pliocene, 113
Arctotherium in Brazilian caves, 144
S. American Pliocene, 146