A. M.  Norman, ?Crustacea, Tunicata, Polyzoa, Echinodermata, Actinozoa, Foraminifera, Polycystina, and Spongida?, in J. Gwyn Jeffreys Preliminary Report of the Biological Results of a Cruise in H.M.S. 'Valorous' to Davis Strait in 1875, Proceedings of the Royal Society, vol. 25, 1876, pp. 202-215.

F.  Canu and Bassler, R. S. , ?Phylum Molluscoidea, Class Bryozoa?, in The fauna of the Ripley formation on Coon Creek, Tennessee, vol. Professional Paper 137, U.S. Geological Survey, 1926, pp. 32-39.