CONTENTS. 



Page 



§ 1. Introduction 1 



§ 2. External characters 3 



§ 3. Muscular System - 10 



§ 4. Nervous System 15 



§ 5. Digestive System 21 



§ 6. Sanguiferous System 23 



§ 7. Respiratory System 26 



§ 8. Reproduction of Parts 27 



§ 9. Generative System 27 



§ 10. Development 29 



§ 11. Conclusion 38 



§ 12. Description of the Plates 40 



