Yaldwyn, J.C. (1960) Biological results of the Chatham Islands 1954 expedition, Part I—Crabs (Decapoda, Brachyura) of the Chatham Islands 1954 Expedition. New Zealand Department of Scientific and Industrial Research Bulletin139(1): 1–7, Plates 1–2. PDF is 24MB (also available in 3 parts)