572 



INDEX. 



Hydrozoa — continued. 



Faculty of stingiug 



Phosphorescence 



Propagation by off-slioots 



Tail of velella . 



Globe beroe 



Nature's steam-boat . 



Varied colour of the sea 



Food of the whale 

 Hydrostatic Acalephse 



Portuguese man-of-wai- 



Long cables 



Eelationsliip of hydrse to Medusae 



Hydra tuba 



Campulanarian zoophytes 



CHAPTER YI. 



Anthozoa (Corals) 



Gardens of tiie sea 



Polype flowers . 

 Alcyons ..... 



Gradual development . 



Mouth surrounded by tentacles 

 Madrepores . , ' , 



Massive skeleton of 



Stone-making corals . 



Growth of coral reefs . 



Coral islands 



True corals 



Eed coral, coral fishing 



Mare's-tail coral . 



Variety of form of coral 



Bai'k-bearing corals 



Sea-pens .... 



Organ-pipe coral, its brilliant colours 

 Actinire ..... 



Like compound flowers 



Actinia gemmacea 



Venomous lasso threads 



Eftects of division of actinia 



Mushroom corals 



CHAPTER VII. 

 Echinodermata .... 



Encrinites ..... 

 Their abundance in a fossil state . 

 Feather-star .... 

 Sea-baskets ..... 



Snake-tailed star-fishes 

 "Brittle-stars" .... 

 Star-fishes, .... 



