†Psilaspis (Entorachis) Kobayashi & Ichikawa 1955

Kobayashi & Ichikawa 1955. Miscellaneous Notes on the Cambro-Ordovician Geology and Palaeontology, No. XXV. Discovery of Proceratopyge in the Chuangia Zone in Manchuria, with a Note on the Ceratopygidae. Transactions of the Palaeontological Society of Japan N S, No. 19 1955: 65-72

Kobayashi 1955. Notes on Cambrian Fossils from Yentzuyai, Tawenkou, in Shantung. Transactions of the Palaeontological Society of Japan N S, No. 20 1955: 89-98