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Updated: June 4, 2025
I kept one specimen, to show old and young barnacles attached to the same Velella. The sea was, this morning, covered in places with fleets of the Velella of Lamarck; also with great numbers of the species of Janthina which I described yesterday; to both of these kinds of animals large clusters of barnacles were frequently attached.
As the barnacles grew larger, the remains of the velella changed into large excrescences, half the size of a walnut. July 16.
The vessel went slowly through the water, but although the net was kept towing we could catch nothing, and there was no appearance of anything being in the sea. July 14. South latitude 20 degrees 52 minutes; west longitude 1 degree 49 minutes. This day we caught a Velella of the following dimensions: Length of interior cartilage 1.1 inches. Breadth of interior cartilage 0.5 inches.
Haeckel had already compared the yellow cells of Radiolarians to the so-called liver-cells of Velella; but the brothers Hertwig first recalled attention to the subject in 1879 by expressing their opinion that the well-known "pigment bodies" which occur in the endoderm cells of the tentacles of many sea-anemones were also parasitic algae.
It swam about from a dead shell of the Velella, to a nautilus, and from that again to some barnacles; each shell that it reached it climbed up, and folding up its fins ran all over it, so that it appeared like a little navigator which was roving from island to island in the ocean, seeking food and nourishment from all of them. Are not the ways of nature very wonderful?
This fish was swimming about, apparently preying on the tentaculae of the barnacles, of which there were numbers round the ship attached to the dead Velella, some of which I had caught yesterday; it appears therefore probable that its mouth was placed in so extraordinary a position to enable it to seize this pendant prey.
Johnnes Muller at first supposed them to be concerned with reproduction, but afterward gave up this view. In his famous monograph of the Radiolarians, Haeckel suggests that they are probably secreting cells or digestive glands in the simplest form, and compares them to the liver-cells of Amphioxus, and the "liver-cells" described by Vogt in Velella and Porpita.
The numerous little animals of the species which I have always considered to be the Velella of Lamarck went sailing merrily by us today; the least breath of wind made them turn round and round; and this was their mode of progression, the animal moved its little sail which I have before mentioned, and worked its tentaculae so vigorously as to make ripples in the water, in the midst of which it went buoyantly floating along.
We also caught a minute fish, 0.6 inches in length; a minute species of nautilus, blue, marked with striae, or grooved, and thus different from what we caught on the 15th; a shrimp-like species of animal 0.5 inches in length; the lower part of a species of Diphyes, which had been caught on the 12th and 13th of November 1837; some minute animals, appearing to be the young of the larger species of Velella which we had taken; they were, like this animal, at first blue, but turned red soon after being put into spirits; also a very minute pale blue species of nautilus, I think the young of the kind we caught on the 15th July.
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