THE SQUID AND OCTOPUS BAETSCH. 375 



smooth surface, and the slightest current fi-om the siphon was sufficient to 

 send it along, the entire animal heiug concealed, the tentacles not trailing 

 hehind, as often described. When the argonaut left tlie shell it crawled about 

 in the position of an octopus, mouth down, but when in the shell its favorite 

 position apparently was with its mouth pointing directly upward, the two 

 dorsal or upper arms thrown back, or it would fasten itself to the glass of the 

 tank by the two large arms and gradually expand them until they were as 

 large as the shell itself, presenting a rippling ultramarine blue on the outer 

 side and iridescent frosted silver on the other. 



