RIDING A SHARK. 



129 



within, like the spirula, while others, like the 

 nautilus and argonaut, are protected by a shell. 



Argonaut with the shell. 



The octopus in these \vaters seldom attains a 

 larger size than this specimen, or a spread of 

 three feet, though in Alaskan waters they have 



Argonaut without the shell. 



been seen measuring twenty-five feet across. 

 The arms, you see, are lined with suckers, and 

 between them are the mouth and bill." 



