The royal natural history . experiments have revealed the fact thatthe streams of light follow regular courses. There are two kinds of streams; theone connected with the polyps proper, and visible on the dorsal side of the feathers,and the other connected with the zooids, and appearing on the lower side. Thetwo streams appear at the same time, as a rule, but either the one or the othermay, without any apparent reason, arise independently. It can be shown that thedirection taken by the streams depends on the part to which irritation is applied. The higher forms of the sea-pens, or those which a
The royal natural history . experiments have revealed the fact thatthe streams of light follow regular courses. There are two kinds of streams; theone connected with the polyps proper, and visible on the dorsal side of the feathers,and the other connected with the zooids, and appearing on the lower side. Thetwo streams appear at the same time, as a rule, but either the one or the othermay, without any apparent reason, arise independently. It can be shown that thedirection taken by the streams depends on the part to which irritation is applied. The higher forms of the sea-pens, or those which actually resemble feathers, arenot found in deep water, none being recorded to exist below six hundred forms have, however, been found; these being related to Umbellulagrcenlandica, which has long been well known. As early as the middle of lastcentury, when the presence of animal life at great depths was quite unknown, twospecimens were brought up from a depth of two hundred and forty fathoms,vol. vi.— 22. a sEA-rEN, Pteroides sphwsa(J nat. size). a, A polyp (somewhat magnified). 5*4 CCELENTERA TES.
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
