on mild climates of Arctic regions, [189]

on ocean-currents, [190], [204]

on age of the earth, [213]

on mean thickness of sedimentary rocks, [220]

on small amount of marine denudation, [225]

on buried river-channels, [336]

Ctenodus, [69]

Cyanopica, distribution of, [24]

Cyanopica cooki, restricted range of, [15], [24]

Cyanopica cyanus, [24]