CONTENTS 
LIst OF THE ORGANS AND TOPICS CONSIDERED IN THE TEXT, CLASSED 
ACCORDING TO THE SYSTEMS TO WHICH THEY RELATE 
Integument and Integumental Organs 
Skeletal System 
Muscular System 
Nervous System 
Sense Organs. 
Alimentary System 
Respiratory System 
Circulatory System 
Urinogenital Apparatus 
SOME ORGANS AND VESTIGES OF ORGANS WHICH SHOW REVERSION TO 
THE CONDITION OF VERY PRIMITIVE VERTEBRATE TYPES 
CONCLUDING REMARKS. 
GLOSSARY OF TECHNICAL ZOOLOGICAL TERMS OCCURRING IN THE TEXT 
INDEX 
XV 
PAGE 
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