Jones, T.R. 1901. On some Carboniferous Shale from Siberia. Geological Magazine 8(10) (new series, Decade IV): 433-436. https://www.biodiversitylibrary.org/page/30752484.
T.R. Jones, 1901. Geol. Mag. 8(10): 435, pl. 16, fig. 18.
T.R. Jones, 1901. Geol. Mag. 8(10): 434, pl. 16, figs. 8-15.