Cox, L. R., Ruth D. Turner, C. P. Nuttall, E. R. Trueman, D. W. Boyd, B. F. Perkins, H. S. Puri, et al. 1971. “Part N, Mollusca 6, Vol. 3, Complete Volume”. Treatise on Invertebrate Paleontology, January. https://doi.org/10.17161/dt.v0i0.5602.