464 
THE OCEAN WORLD. 
ancients and moderns, we are compelled to declare that there is 110 
truth in the often-repeated statement that the Nautilus uses its pah 
mated arms as oars or sails. In order to swim on the surface, it comports 
itself as all other Cephalopods do. It uses neither oars nor sails, and 
the palmate arms only servo to envelop and retain its hold on its frail 
Fig. 321. Argonauta papyraceu, as it swims by means of its locomotive tube. 
shell. Its principal apparatus of progression is the locomotive tube with 
which it is furnished, in common with all Cephalopods, and which is 
the Nautilus very long. Aided by this apparatus, it ejects the watt’ 1 ' 
after it has served the purpose of respiration, and, in doing so, projects 
itself against the liquid, as it were. While it advances through th e 
water under this impulse, its pendent arm 3 - 
elongated and reunited in bundles extend- 
ing the whole length of the shell (Fig 9, 
32 1 and 322), shows the position of the 
different parts of the animal when it thus 
breasts the ■waves. These arms are als° 
powerful aids when the animal creeps ° n 
the ground at the bottom of the sea. 
When the animal is disturbed it retire 3 
^ A O' | I • ^ f ’ C/‘ * r 
Fig. 322. Argonauta papyracea in its 
shell. 
completely into its shell. From that moment, the equilibrium being 
changed, the shell is overturned, and the animal is nearly invisible- 
If frightened, it entirely submerges itself, and sinks to the bottom- 
These little beings share with other Cephalopods the strange faculty 
of changing colour under the influence of some vivid impression ; but 
their graceful and delicate ox-ganization redeems (hem from the ebarg e 
we have brought against the cuttles. The Nautilus can blush, turn 
pale, and show through its transparent shell its body changing 111 
sudden shades; but it never exhibits those bristling, unpleasant 
tubercles, the hideous inheritance of the larger and coarser Cephal 0 ' 
pods — the tyrants of the sea. 
The Nautilus carries its egg in the shell, and the little ones are also 
