Page 113 - Design in Nature

Athin layer of skin that surrounds the arms and the body further supports the reactive
swimming system of the cuttlefish. The fish floats in the water by means of waving this curtain-
like membrane. The arms, on the other hand, function to balance the body during the floating.
They also work for braking during stopping.

The reactive swimming systems of the octopus and the cuttlefish actually function
according to a principle that resembles jet planes. Through a closer
examination, it is obvious that their muscular systems have been
designed in the way most suited to them. It is, of
course, absurd to assert that such complex
structures could have been formed
through coincidences.