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Updated: May 14, 2025
Upon these two days we were in a rapid current, which we entered on the morning of the 27th, and on neither could we see the slightest signs of any of the acalepha class; but on the 29th, on which day we experienced no current, we found the greatest abundance of these animals; it appeared as if they had collected in large quantities at the edges of the current; and on the western side of it we found many animals which I had not seen on the opposite one.
These barnacles preyed on the different gelatinous animals which were swimming about. It was curious to see them seize on these with their hooked tentaculae and draw them in, whilst the acalepha, or gelatinous animal, contracted and dilated itself with all its might and main, endeavouring to escape.
The sea was full of some things resembling hairs, but which broke the moment they were touched. On this evening we placed a large number of acalepha in a bucket, and on agitating the water it became a mass of phosphorescent light. It is strange that these animals should never emit this light without being irritated. July 1.
This irregular movement of the animals gives to the whole body an irregular rotatory motion; but when one is separated from the others it can only drive itself round and round upon its own centre, and has not the faculty of propelling itself as the other acalepha have. They also swim with either end foremost, in the manner the other acalepha do.
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