In 1902 the number of men employed in the home fisheries was 144,000 and the number of vessels 25,481 (tonnage 127,000); in the deep-sea fisheries 10,500 men and 450 vessels (tonnage 51,000) were employed.
The Auronectae are peculiar deep-sea forms, little known except from Haeckel's descriptions, in which the large pneumatophore has a peculiar duct, termed the aurophore, placed on its lower side in the midst of a circle of swimming-bells.
" Deep Sea Medusae," in Reports of the Challenger Expedition, Zool.
Actual or projected routes for telegraph cables across the deep sea have also been sounded with extreme accuracy in many cases; but beyond these lines of sounding the vast spaces of the ocean remain unplumbed save for the rare researches of scientific expeditions, such as those of the " Challenger," the " Valdivia," the " Albatross " and the " Scotia."