Beneden's treatise on the development, transformation, and life-histories of parasitic worms won the Grand prix des sciences physiques of the Institut de France. It was published in the "International Scientific Series" (1875), under the title Les commensaux et les parasites dans le règne animal, and was translated into English and German. The 1875 edition introduced the key biological concept Commensalism. In ecology this is defined as "a class of relationships between two organisms where one organism benefits from the other without affecting it. This is in contrast with mutualism, in which both organisms benefit from each other, amensalism, where one is harmed while the other is unaffected, and parasitism, where one benefits while the other is harmed." Digital facsimile of the 1858 edition from the Internet Archive at this link. English translation with commensaux quaintly translated as "messmates" in Animal parasites and messmates (1876). Digital facsimile of the English translation from Google Books at this link.