Several prosimian primates have been found to have mitotically-active germ cells in the adult ovary, including the brown greater galago (Galago crassicaudatus), the Demidoff's bushbaby (G. demidoffi) and the potto (Perodicticus potto) (Ioannou, 1967). These cells were found in germ cell nests located in the adult ovarian cortex and tritiated thymidine studies demonstrated DNA synthesis activity (Ioannou, 1967). Similar studies on the Senegal galago (G. senegalensis) concluded that, by examining staining intensity and meiotic stage, some labelled oogonia had undergone at least one mitotic division and some had entered meiosis in the 10 days between labelling and ovariectomy (Butler and Juma, 1970). In addition, the loris family are prosimian primates related to the lemur, of which two members have been described as having post-natal proliferating germ cells: one member of each of the loris subcategories, a slow loris (Nycticebus coucang) (Duke, 1967) and a slender loris (Loris tardigradus lydekkerianus) (Ioannou, 1967, David et al., 1974). These studies also demonstrated uptake of tritiated thymidine by collections of cells within the ovarian cortex; however, the ability of these cells to undergo post-natal oogenesis and folliculogenesis has not been proven.