The substance composing their bodies appeared to be not unlike that of a terrestrial jelly-fish, but much denser.

It seemed from their motions to have the tenacity of soft indiarubber save at the headed ends, where it was much harder.

The necks were protected for about fifty feet by huge scales of a dull, greenish hue.
When one of them had overpowered an enemy or a victim the two sank down into the vegetation, and the victor began to eat the vanquished.

Their means of locomotion consisted of huge fins, or rather half-fins, half-wings, of which they had three laterally arranged behind each head, and four much longer and narrower, above and below, which seemed to be used mainly for steering purposes.
They moved with equal ease in either direction, and they appeared to rise or fall by inflating or deflating the middle portions of their bodies, somewhat as fish do with their swimming bladders.
The light in the lower regions of this strange ocean was dimmer than earthly twilight, although the _Astronef_ was steadily making her way beneath the arch of the rings towards the sunlit hemisphere.
"I wonder what the effect of the searchlight would be on these fellows!" said Redgrave.

"Those huge eyes of theirs are evidently only suited to dim light.