572 



INDEX. 



Hydrozoa continued. 



Faculty of stinging 



Phosphorescence 



Propagation by off-shoots 



Tail of velella . 



Globe beroe 



Nature's steam-boat 



Varied colour of the sea 



Food of the whale 

 Hydrostatic Acalepbse 



Portuguese man-of-war 



Long cables 



Relationship of hydrse to Medusae 



Hydra tuba 



Campulanarian zoophytes 



CHAPTEE YI. 



Anthozoa (Corals) .... 



Gardens of the 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 ... 



Red coral, coral fishing 



Mare's-tail coral .... 



Variety of form of coral 



Bark-bearing corals 



Sea-pens ..... 



Organ-pipe coral, its brilliant colours 

 Actiniae ...... 



Like compound flowers 



Actinia gemmacea 



Venomous lasso threads 



Effects of division of actiniae 



Mushroom corals 



CHAPTER VII. 



Echinodermata .... 



Encrinites 



Their abundance in a fossil state . 

 Feather-star .... 

 Sea-baskets . 

 Snake-tailed star-fishes 

 "Brittle-stars" .... 

 Star-fishes. 



