I end here this catalogue, which is somewhat dry perhaps, but very exact, with a series of bony fish that I observed in passing belonging to the apteronotes, and whose snout is white as snow, the body of a beautiful black, marked with a very long loose fleshy strip; odontognathes, armed with spikes; sardines nine inches long, glittering with a bright silver light; a species of mackerel provided with two anal fins; centronotes of a blackish tint, that are fished for with torches, long fish, two yards in length, with fat flesh, white and firm, which, when they arc fresh, taste like eel, and when dry, like smoked salmon; labres, half red, covered with scales only at the bottom of the dorsal and anal fins; chrysoptera, on which gold and silver blend their brightness with that of the ruby and topaz; golden-tailed spares, the flesh of which is extremely delicate, and whose phosphorescent properties betray them in the midst of the waters; orange-coloured spares with long tongues; maigres, with gold caudal fins, dark thorn-tails, anableps of Surinam, etc. Notwithstanding this “et cetera,” I must not omit to mention fish that Conseil will long remember, and with good reason. One of our nets had hauled up a sort of very flat ray fish, which, with the tail cut off, formed a perfect disc, and weighed twenty ounces. It was white underneath, red above, with large round spots of dark blue encircled with black, very glossy skin, terminating in a bilobed fin. Laid out on the platform, it struggled, tried to turn itself by convulsive movements, and made so many efforts, that one last turn had nearly sent it into the sea. But Conseil, not wishing to let the fish go, rushed to it, and, before I could prevent him, had seized it with both hands. In a moment he was overthrown, his legs in the air, and half his body paralysed, crying— “Oh! master, master! help me!” It was the first time the poor boy had spoken to me so familiarly. The Canadian and I took him up, and rubbed his contracted arms till he became sensible. The unfortunate Conseil had attacked a cramp-fish of the most dangerous kind, the cumana. This odd animal, in a medium conductor like water, strikes fish at several yards’ distance, so great is the power of its electric organ, the two principal surfaces of which do not measure less than twenty-seven square feet. The next day, April 12th, the _Nautilus_ approached the Dutch coast, near the mouth of the Maroni. There several groups of sea-cows herded together; they were manatees, that, like the dugong and the stellera, belong to the sirenian order. These beautiful animals, peaceable and inoffensive, from eighteen to twenty-one feet in length, weigh at least sixteen hundredweight. I told Ned Land and Conseil that provident nature had assigned an important role to these mammalia. Indeed, they, like the seals, are designed to graze on the submarine prairies, and thus destroy the accumulation of weed that obstructs the tropical rivers.