Bears, probable cause of absence of, from tropical Africa, 291
Beaver, N. American Tertiary, 140
Beetles, families selected for study, 103
from the Lias, 167
of Azores, 207
of Japan, 228
Belemnoziphius, European Pliocene, 112
Belt, Mr., his theory of a great Siberian lake during the glacial epoch, 218
on change of climate caused by diminution of obliquity of ecliptic, 466
Birds, means of dispersal of, 15