| Cambrian Agnostida of North America und Greenland. Part 1, Ptychagnostidae |
| Cambrian Agnostida of North America and Greenland. Part 1, Ptychagnostidae. - The University of Kansas, Palaeontological Contributions, 109: 1-60, Fig. 1-32; Lawrence, Kansas. |
| Lejopyge lundgreni (TULLBERG 1880), Beschreibung ab Seite 46, Abb. Fig. 27 + 28 |