1. Trinucleus Murchison, 1839, as a Nomen Conservandum;Shaw;Journ. Paleont.,1950
2. Bancroft B. B. , 1933. Correlation Tables of the Stages Costonian–Onnian in England and Wales. Published by the author, Blakeney, Gloucestershire.
3. Some new species of Cryptolithus (s.l.), from the Upper Ordovician;Bancroft;Mem. Manchr. Lit. Phil. Soc.,1929