CONTENTS. 



CHAPTER I. 



THE SUB-KINGDOM CCELENTERATA. 



. General characters.— 2. Classes 



Page 

 3 



CHAPTER II. 



THE CLASS HYDROZOA. 



SECTION I. 



MORPHOLOGY AND PHYSIOLOGY OP 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 . 



51 



I. 



SECTION III. 



CLASSIFICATION OF HYDROZOA. 



Classification. — - 2. Order 1 : Hydridse. — - 3. Order 2: Cory- 



nida?.— 4. Order 3 : Sertularidae.— .5. Order 4 : Calycopho- 



6. Order 5 : Physophoridae.— 7. Order 6 : Medusidse. 



rida?. 



8. Order 7 : Lucernaridse . 



79 



