CONTENTS 



PAGE 



VI. Nervous System and Organs of Sense . . .69 



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

 smell, 72 ; 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. 



CHAPTEE 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, 9S; 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 ; Frocchidna, 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 Dasyuriixe, 136 ; Subfamily Dasyurinre. 136 ; 

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

 gale, 139; Sminthopsis, 139; Antechinomys, 139; Subfamily 

 Myrmecobiina?, 140; Myrmccobius, 140. Family PeramelhXE, 

 141 : I'< nancies, 142; Fcragalc, 143; Chmropus, 143. 



