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Besides this means of defence, an acrid secretion, which is spread over its body, causes a sharp, stinging sensation, similar to that produced by the Physalia, or Portuguese man-of-war. I was much interested, on several occasions, by watching the habits of an Octopus, or cuttle-fish. Although common in the pools of water left by the retiring tide, these animals were not easily caught.
In this curious Acalephian Hydroid, or Physalia, the individuality of function is even more marked than in the Hydractinia.
We had not rowed many strokes before one of the Physalia was observed floating by, its back ornamented with a fringe tinted with light-blue, delicate sea-green, and crimson. "I'll have it," exclaimed Jellybag, leaning over the bows and grasping hold of it, regardless of the injury he was inflicting.
In the Physophoridæ a variety of organs similarly arise by transformation of the budding polypes; so that in creatures like the Physalia, commonly known as the "Portuguese Man-of-war," instead of that tree-like group of similar individuals forming the original type, we have a complex mass of unlike parts fulfilling unlike duties.
Besides this means of defence, an acrid secretion, which is spread over its body, causes a sharp, stinging sensation, similar to that produced by the Physalia, or Portuguese man-of-war. I was much interested, on several occasions, by watching the habits of an Octopus, or cuttle-fish. Although common in the pools of water left by the retiring tide, these animals were not easily caught.
I remember, on one calm day, when the ship was scarcely moving through the water, a boat was lowered to enable us to capture some of the Physalia, or Portuguese men-of-war, which were seen in unusual numbers gliding over the surface of the deep. Several of the passengers, among whom were three of the cadets, formed the party intent on scientific discovery.
Besides these animals, six varieties of Pteropodes were caught; also a Glaucus, differing from that of the Atlantic Janthina penicephala Per., a Planaria, Salpa vivipara Per., a Pyrosoma, resembling that of the Atlantic, and a Lepas, attached to the shell of the Janthina. Our collection of Acalephi was extremely rich; of fourteen kinds taken, only one, Physalia Lamartinieri, was known to us.
Among other zoophytes there were Portuguese men-of-war known by the name Physalia pelagica, like big, oblong bladders with a pearly sheen, spreading their membranes to the wind, letting their blue tentacles drift like silken threads; to the eye delightful jellyfish, to the touch actual nettles that ooze a corrosive liquid.
One day, however, by merely touching my face with one of the branches, pain was instantaneously caused; it increased as usual after a few seconds, and remaining sharp for some minutes, was perceptible for half an hour afterwards. The sensation was as bad as that from a nettle, but more like that caused by the Physalia or Portuguese man-of-war.
One day, however, by merely touching my face with one of the branches, pain was instantaneously caused; it increased as usual after a few seconds, and remaining sharp for some minutes, was perceptible for half an hour afterwards. The sensation was as bad as that from a nettle, but more like that caused by the Physalia or Portuguese man-of-war.
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