“ MARCOU, JULES (1824–1898) , Swiss-American geologist, was born at Salins, in the department of Jura, in France, on the 20th of April 1824. He was educated at Besançon and at the college of St Louis, Paris. He worked in early years with J. Thurmann (1804–1855) on the geology of the Jura mountains. In 1847 he went to North America as travelling geologist for the Jardin des Plantes, and in the following year in Boston he joined Agassiz, whom he had met in Switzerland, and accompanied him to the Lake Superior region. ”