xii TABLE OF CONTENTS 



CHAPTER VI. AMPHIBIA PAGES 



Introductory 173-179 



Extinct Amphibia 180-183 



Present-day Amphibia 183-203 



The development of the frog 203-209 



CHAPTER VII. REPTILIA 



Introductory 210-213 



Extinct reptiles 213-224 



Modern reptiles 225-259 



CHAPTER VIII. AVES (BIRDS) 



Introductory 260-276 



Extinct birds 276-281 



Birds of to-day 281-312 



Ratitse 281-288 



Carinatse 288-312 



Development of birds .314-323 



CHAPTER IX. MAMMALIA 



Introductory 324-336 



Extinct mammals 336-345 



Mammals of the present 345-359 



Prototheria 347-352 



Eutheria (Didelphia) ; 352-359 



CHAPTER X. MAMMALIA (CONTINUED) PLACENTAL MAMMALS 



Unguiculata 360-363 



Dermoptera 363 



Chiroptera 363-364 



Carnivora 364-371 



Rodentia 371-373 



Edentata 373-377 



Tubulidentata 377-378 



Primates 378-388 



Artiodactyla ' 389-392 



Perissidactyla 392-396 



Sirenia 396-398 



Hyracoidea 398-400 



