CONTENTS. 



CHAPTER I. 



PAGE 



THE OCEAN , 1 



Depth of the Sea . . . . , 5 



Colour of the Ocean .... 11 



Phosphorescence 13 



Saltness of the Sea .... 15 



CHAPTER II. 



CURRENTS OF THE OCEAN ... 27 



Trade-winds 28 



Gulf Stream 31 



Storms 32 



Tides 35 



Polar Seas 43 



Antarctic Seas ..... 50 



CHAPTER III. 



LIFE IN THE OCEAN . 60 



CHAPTER IV. 



ZOOPHYTES , 68 



Foraminifera 87 



Infusoria .97 



CHAPTER V. 



POLYPIFEHA . . . . . , H6 



CHAPTER VI, 



CORALLINES ....... 119 



Tubiporinse ...... 120 



Gorgoniadse 121 



Isidians , 124 



CHAPTER VII. 



PAGE 



ZOANTHARIA 147 



Madreporidse 149 



Porites 162 



Actiniaria 181 



Mmyadinians 193 



CHAPTER VIII. 



ACALEPHJB 195 



MedusadsB 213 



Rhizostoma 219 



Vilelladse 229 



Ctenophora 254 



CHAPTER IX. 



ECHINODERMATA 259 



Asterias 260 



Crinoidea 270 



Echinidae 280 



MOLLUSCA. 



GENERAL DEFINITION 301 



CHAPTER X. 



MOLLUSCOIDA 303 



Tunicata 309 



Ascidians 309 



CHAPTER XL 



ACEPHALOUS MOLLUSCA 316 



