xiv CONTENTS. 
CHAPTER XXIII. 
CHORDATA (continued). 
Lepus, as a Type of Mammalia 
CHAPTER XXIV. 
GENERAL FEATURES OF CHORDATA. 
Phylum Chordata 
Sub-Phylum Artriozoa ... 
Sub-Phylum Vertebrata 
General Features of Vertebrata 
Nervous System ... 
Sense-organs 
Skeletal System ... fe 
Blood-vascular System ... 
Alimentary System 
Urogenital System 
Development 
CHAPTER XXV. 
CLASSES OF VERTEBRATA. 
Cyclostomata 
Pisces 
Amphibia ... 
Reptilia 
Aves 
CHAPTER XXVI. 
GENERAL FEATURES OF MAMMALIA, 
Skin 
Hair 
Teeth : sts 
Brain and Nervous System 
Circulatory System 
Urogenital System 
Skeleton ... : 
Development 
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