Detailed information for reference 33618Squires, R.L. and R.A. Dimetrion (1995) A new genus of cassiduloid echinoid from the lower Eocene of the Pacific coast of western North America and a new report of Cassidulus ellipticus Kew, 1920, from the lower Eocene of Baja California Sur Mexico. Journal of Paleontology 69(3): 509-515, figs. 1-7. PDF is 30MB (also available in 3 parts)
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