CONTENTS. 



CHAPTER I. 



THE SUB-KINGDOM CCELENTERATA. 



Page 

 1. General characters. — 2. Classes • . • .3 



CHAPTER n. 



THE CLASS HYDROZOA. 



SECTION I. 



3IORPHOLOGY AND PHYSIOLOGY OF HYDROZOA. 



I. Type of the Class : Hydra. — 2. General Morphology. — 3. Or- 

 gans of Nutrition. — 4. Prehensile apparatus. — 5. Tegu- 

 mentary Organs. — 6. Muscular System and Organs of 

 Locomotion. — 7. Nervous System and Organs of Sense. — 

 8. Reproductive Organs . ... 20 



SECTION II. 



DEVELOPMENT OF HYDROZOA . . . . • 5^ 



SECTION III. 



CLASSIFICATION OF HYDROZOA. 



I. Classification. — 2. Order i : Hydridae. — 3. Order 2 : Cory- 

 nidae. — ^4. Order 3: Sertularidae. — 5. Order 4: Calycopho- 

 ridse. — 6. Order 5 : Physophoridae. — 7. Order 6 : Medusidae. 

 — 8. Order 7 : Lucernaridae . . . . -79 



