THE DEEP SEA 



are many reds, e.g. in Crustaceans and Anemones ; 

 there are shades of orange and yellow ; there are 

 some instances of beautiful blue ; there is almost 

 no green. It is noteworthy that there is very little 

 in the way of spots or stripes, most of the animals 

 being all one colour. Perhaps the Deep-Sea colours 

 are like those in withering leaves without utility 

 in themselves. 



Two Deep -Sea Fishes. L, Luminous organ. 



Another problem the most general of all is 

 raised by the fact that many Deep-Sea animals are 

 quite closely related to shore animals, with essentially 

 the same activities discharged by similar organs, and 

 yet under such different conditions of temperature 

 and pressure. Processes of digestion, for instance, 

 which go on in shore animals in the warmth of the 

 Tropics, are also going on on the floor of the Deep 

 Sea at a "temperature near the freezing-point of 



fresh p water. 



217 



