Harrington 1959. Trilobita Treatise on Invertebrate Paleontology Part O Arthropoda 1., R. C. Moore [ed.], Univ. Kansas Press & Geol. Soc. Amer.1959: 038-0560 text-figs. 27-415 [Co-authors G. Henningsmoen, B. F. Howell, V. Jaanusson, C. Lochman-Balk, R. C. Moore, 0. Poulsen, F. Rasetti, E. & R. Richter, H. Schmidt, K. Sdzuy, W. Str, 1959: pp. 038-0560. Chapter pagination: pp. 038-0560