Williams and Downie, 1969
From dinoflaj3
Williams, G.L. and Downie, C., 1969: Generic re-allocations proposed by G.L. Williams and C. Downie. In: Davey, R.J., Downie, C., Sarjeant, W.A.S. and Williams, G.L., Appendix to "Studies on Mesozoic and Cainozoic dinoflagellate cysts"; British Museum (Natural History) Geology, Bulletin, Appendix to Supplement 3, p.17.