xu 



CONTENTS. 



SECTION IV. 



DISTRIBUTION OF HYDROZOA. 



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

 bution. — 3. Geographical Distribution 



Page 



SECTION V, 



. 126 



RELATIONS OF HYDROZOA TO TIME 



130 



CHAPTER III. 



THE CLASS ACTINOZOA. 



SECTION I. 



MORPHOLOGY AND PHYSIOLOGY OF ACTINOZOA. 



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

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

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

 System and Organs of Locomotion. — 8. Nervous System 

 and Organs of Sense. — 9. Reproductive Organs 



SECTION II 



DEVELOPMENT OF ACTINOZOA . 



m 



. 170 



SECTION III. 



CLASSIFICATION OF ACTINOZOA. 



I. Classification. — 2. Order 1 : 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 . . • ^3* 



