Preston, H.B. 1909. Descriptions of seventeen new species and varieties of land and freshwater shells from East and West Africa. Annals and Magazine of Natural History 3 (8th series): 180-187. Available electronically.
Preston, 1909. Ann. Mag. Nat. Hist. 3: 186, pl. 7, fig. 18.
Preston, 1909. Ann. Mag. Nat. Hist. 3: 186, pl. 7, fig. 17.