the anatomy of corals, but she is most renowned today for her contributions to the study of sponges. She was most likely the first Norwegian to study sponges and few Norwegians have focused on the species since. Arnesen published papers on sponges between 1901 and 1920, with her 1903 paper on the geographical distribution of sponges being especially important. Arnesen wrote a text book to be used for high school level zoology, which focused heavily on Charles Darwin's ideas about evolution. She also published the first guidebook for the zoological museum in 1912. This covered the many different groups of invertebrates and explained collections that were on display. Arnesen's contribution to sponges is acknowledged in the names of a number of sponges: Haliclona arnesenae, Anchinoe arneseni (now junior synonym of Phorbas perarmatus), and Clathrina arnesenae. References 1867 births 1928 deaths Scientists from Oslo Women zoologists 19th-century Norwegian zoologists Schoolteachers from Oslo Norwegian expatriates in Sweden Norwegian expatriates in Switzerland Norwegian expatriates in the Netherlands Norwegian Association for Women's Rights people University of Oslo alumni University of Zurich alumni Academic staff of the University of Oslo 20th-century Norwegian zoologists