CONTENTS 



PAGE 



VI. Ni-rvous System and Organs of Sense . . .69 



Brain, 69 ; Nerves, 71 ; Sense of touch, 72 ; Taste and 

 smell, 7-2 : Sight, 72 ; Hearing, 73. 



VII. Reproductive Organs . . . . .74 



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 . . 82 



Origin, 82 ; Classification, 84 ; Table of orders and 

 families, 88. 



CHAPTER IV 



GEOGRAPHICAL AND GEOLOGICAL DISTRIBUTION . . 93 



I. Geographical Distribution . . . .93 



Zoological regions, 96 ; Palsearctic 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 ; Multi- 

 tuberculata, 109 ; Polyprotodont types, 113 ; Tertiary mammals, 

 115. 



CHAPTER V 



THE SUBCLASS PROTOTHERIA OR ORNITHODELPHIA . . 117 



General characters, 117. Family ORNITHORHYNCHIDJE, 

 119 ; Ornithorhynchus, 119. Family ECHIDNIDJE, 124 ; 

 Echidna, 125 ; Proechidna, 126 ; Fossil species, 127. 



CHAPTER VI 



THE SUBCLASS METATHERIA OR DIDELPHIA . . .128 



General characters, 128 ; Distribution, 131 ; Classification, 

 131. 



Suborder POLYPROTODONTIA . . 133 



Family DIDELPHYID.E, 133 ; Chironectes, 134 ; Didelphys, 

 135. Family DASYTJRID.E, 136 ; Subfamily Dasyurinse, 136 ; 

 Thylacinus, 136 ; Sarcophilus, 137 ; Dasyurus, 138 ; Phascolo- 

 gale, 139 ; Sminthopsis, 139 ; Aiitechinomys, 139 ; Subfamily 

 MyrmecobiiniE, 140; Myrmecobius, 140. Family PERAMELID.E, 

 141 ; Perameles, 142 ; Peragale, 143 ; CJueropus, 143. 



