Molluscs 155 



When threatened with danger it turns 

 ashen grey. 



The octopus like the cuttle-fish is the 

 possessor of a peculiar gland secreting 

 an inky fluid which is stored in a special 

 bag and expelled through the funnel. 

 The " sepia " is used with considerable 

 strategy, for as soon as the black fluid, 

 which hangs in the water in the form of a 

 dense cloud, is ejected it completely en- 

 velops the pursuer. The octopus is thus 

 enabled to confound its enemy and make 

 good its escape. 



