Hancock, H. & Atthey, T. (1872)
A few Remarks on Dipterus and Ctenodus, and on their Relationship to Ceratodus Forsteri, Krefft. Transactions of the Natural History Society of Northumberland, Durham, and Newcastle–upon–Tyne, 4(17), 397–423
Hancock, H. & Howse, R. (1870)
On Janassa bituminosa SCHLOTHEIM from the Marl-slate of Midderidge, Durham. Annals and Magazine of Natural History, (Series 4), 5, 47–62