x CONTENTS 
VI. Nervous System and Organs of Sense 
Brain, 69; Nerves, 71; Sense of touch, 72; Taste and 
smell, 72; Sight, 72; Hearing, 73. / 
VII. Reproductive Organs 
Testes, 74; Penis, 74; Ovaries and oviduct, 75 ; Mammary 
glands, 75 ; Secondary sexual characters, 76 ; Placenta, 76. 
CHAPTER III 
ORIGIN AND CLASSIFICATION OF THE MAMMALIA 
Origin, 82; Classification, 84; Table of orders and 
families, 88. 
CHAPTER IV 
GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION 
I. Geographical Distribution : F . 
Zoological regions, 96 ; Palearctic region, 97; Ethiopian 
region, 98; Oriental region, 100; Celebes, 102; Nearctic region, 
102; Neotropical region, 108; Aquatic mammals, 104. 
II. Geological Distribution . : 
Sequence of strata, 107; Mesozoic mammals, 109; Multi- 
tuberculata, 109 ; Polyprotodont types, 113; Tertiary mammals, 
115. 
CHAPTER V 
THE Supciass PROTOTHERIA OR ORNITHODELPHIA 
General characters, 117. Family ORNITHORHYNCHIDS, 
119; Ornithorhynchus, 119. Family Ecuipnips, 124; 
Echidna, 125 ; Proechidna, 126 ; Fossil species, 127. 
CHAPTER VI 
Tue Svuscuass METaTHERIA OR DIDELPHIA 
General characters, 128; Distribution, 131; Classification, 
181. 
Suborder POLYPROTODONTIA A : ; : 
Family DIDELPHYID&, 133; Chironectes, 1384; Didelphys, 
135. Family DasyurIDE, 136 ; Subfamily Dasyurine, 186 ; 
Thylacinus, 136 ; Sarcophilus, 1387 ; Dasyurus, 188 ; Phascolo- 
gale, 139 ; Sminthopsis, 139; Antechinomys, 1389; Subfamily 
Myrmecobiine, 140; Myrmecobius, 140. Family PERAMELIDS, 
141; Perameles, 142; Peragale, 148; Chewropus, 148. 
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