Detailed
information for reference 33820
Durham, 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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