National Geographic : 1961 Feb
Feathery tentacles of a porpita, armed with dotted clumps of sting cells, fish unceasingly for plankton. Porpitas, close relatives of jellyfish, float on the surface; at times they fleck the sea for miles with inch-sized spots of blue. 218 Sausage sails of eight Portuguese men-of-war glisten in Gulf Stream shallows. Trimmed at will, the sails catch the breeze and propel the animals. Elastic tentacles trap and sting small fish; poison cells sting bathers too, sometimes fatally.