CHAPTER IV

GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION 93

I. Geographical Distribution 93

Zoological regions, 96; Palæarctic region, 97; Ethiopian region, 98; Oriental region, 100; Celebes, 102; Nearctic region, 102; Neotropical region, 103; Aquatic mammals, 104.

II. Geological Distribution 107

Sequence of strata, 107; Mesozoic mammals, 109; Multituberculata, 109; Polyprotodont types, 113; Tertiary mammals, 115.