As to the first sub-class, it gives several specimens of that singular looking fish appropriately called a ‘seafrog,’ with large head, sometimes pierced with holes, sometimes swollen with protuberances, bristling with spikes, and covered with tubercles; it has irregular and hideous horns; its body and tail are covered with callosities; its sting makes a dangerous wound; it is both repugnant and horrible to look at.” From the 21st to the 23rd of January the Nautilus went at the rate of two hundred and fifty leagues in twenty-four hours, being five hundred and forty miles, or twenty-two miles an hour. If we recognised so many different varieties of fish, it was because, attracted by the electric light, they tried to follow us; the greater part, however, were soon distanced by our speed, though some kept their place in the waters of the Nautilus for a time. The morning of the 24th, in 12° 5′ S. lat., and 94° 33′ long., we observed Keeling Island, a coral formation, planted with magnificent cocos, and which had been visited by Mr. Darwin and Captain Fitzroy. The Nautilus skirted the shores of this desert island for a little distance. Its nets brought up numerous specimens of polypi and curious shells of mollusca. Some precious productions of the species of delphinulae enriched the treasures of Captain Nemo, to which I added an astraea punctifera, a kind of parasite polypus often found fixed to a shell.