Detailed information for reference 33820Durham, J.W., K.E. Caster, H. Exline, H.B. Fell, A.G. Fischer, D.L. Frizzell, and others (1966) Treatise on Invertebrate Paleontology, Part U, Echinodermata 3, Volume 2. Moore, R.C. (ed.) Geological Society of America and University of Kansas Press: New York. , figs. 272-534.
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