XU CONTENTS. 



SECTION IV. 



DISTRIBUTION OF HYDROZOA. 



Page 

 I. Relations to Physical Elements. — 2. Bathymetrical Distri- 

 bution. — 3. Geographical Distribution . . . 126 



SECTION V. 



RELATIONS OP HYDROZOA TO TIME . . • . I30 



CHAPTER in. 



THE CLASS ACTIXOZOA. 



SECTION I. 



MORPHOLOGY' AND PHY'SIOLOGY' OF ACTINOZOA. 



I. Type of the Class : Actinia. — 2. General Morpholog3% — 3. 

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

 mentary Organs. — 6. Corallum or Skeleton. — 7. Miiscular 

 System and Organs of Locomoiion. — S, Nervous System 

 and Organs of Sense. — 9. Reproductive Organs 151 



SECTION II. 



DEVELOPMENT OF ACTINOZOA . ... I70 



SECTION III. 

 CLASSIFICATION OF ACTINOZOA. 



I. Classification. — 2. Order i: Zoantharia. — 3, Order 2: Alcyo- 

 naria. — 4. Order 3: Rugosa. — 5. Order 4: Ctenophora . i96 



SECTION IV. 



DISTRIBUTION OF ACTINOZOA. 



I . Relations to Physical Elements. — 2. Bathymetrical Distri- 

 bution. — 3. Geographical Distribution . . . 231 



