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They feel when they are touched, seek for food, seize and devour it; they are of various kinds and colours, and are known under the general name of zoophytes. "And this which glitters in such beautiful colours on the sea, is called pyrosoma," said Ernest. "See, here are some I have caught in my hat; you may see them move.
Ah! how glad I shall be to tell her all about our voyage, and my excursion into the sea, and how Fritz dragged me by the hair, and what they call these fiery fishes; tell me again, Ernest; py py " "Pyrosoma, Mr. Peron calls them," said Ernest. "The description of them is very interesting in his voyage, which I have read to mamma; and as she would recollect it, she would not be afraid."
Each individual resembles a minute cylinder of glowing phosphorus. Sometimes they are seen adhering together in such prodigious numbers that the ocean appears as if covered with an enormous mass of shining phosphorus or molten lava." Professor Moseley investigated the Pyrosoma while with the Challenger expedition. He wrote: "A giant Pyrosoma was caught by us in the deep-sea trawl.
But we will pass over these cases in order to dwell more particularly on the remarkable tunicate known as Pyrosoma, a name indicative of its phosphorescent property, being derived from two Greek words signifying fire-body.
Establishment of the First Empire. Reluctance of the French Government to publish a record of the expedition. Report of the Institute. The official history of the voyage authorised. Peron's scientific work. His discovery of Pyrosoma atlanticum. Other scientific memoirs. His views on the modification of species. Geographical results. Freycinet's charts.
Every sea-pen is glorious in its light, in fact, nearly every eight-armed Alcyonarian is thus resplendent, and the social Pyrosoma, bulky and a free swimmer, glows like a bar of hot metal with a white and green radiance." Such accounts are enough to indicate how varied and how general a phenomenon is the phosphorescence of the sea.
"I pray to God," replied I, "that she may have nothing more to fear than the pyrosoma, and that we may soon see them again, with her and Francis." We all said Amen; and, the day breaking, we decided to weigh the anchor, and endeavour to find a passage through the reefs to reach the island, which we now distinctly saw, and which seemed an uncultivated and rocky coast.
As shown in the illustration Pyrosoma is not a single creature, but is composed of a whole colony of individuals, each of which is represented by one of the projections on the surface of the tube, closed at one end, which they all combine to form. The free end on the exterior contains the mouth, while there is another opening in each individual toward the interior of the tube.
I wrote my name with my finger on the surface of the giant Pyrosoma as it lay on deck, and my name came out in a few seconds in letters of fire."
But Mr Huxley shews, by observation and experiment on Salpa and Pyrosoma, that each has independent powers of reproduction, and his facts are conclusive against the theory of 'alternation of generations. The two generations, as now appears, are not of distinct individuals, but are both required to make a complete individual.
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