Materialia Ad Zoographiam Ponticam Comparatam. Fasciculum III. Vermes. Class I. Turbellaria Ehrbg. - Czerniavsky, V. (Bulletin de la Societe imperiale des naturalistes de Moscou, 1880)
The date is here set at 1880, as both Biodiversity Heritage Library as well as Graff (1882) set the date at 1880.