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Morton, S. G.,1842. Description of some new species of organic remains of the Cretaceous Group of the United States: with a tabular view of the fossils hitherto discovered in this formation. Journal of the Academy of Natural Sciences of Philadelphia, ser. 3, vol. 8, pt. 2, pp. 207-227, pls. 10 and 11.
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Morton, S. G.,1842. Description of some new species of organic remains of the Cretaceous Group of the United States: with a tabular view of the fossils hitherto discovered in this formation. Journal of the Academy of Natural Sciences of Philadelphia, ser. 3, vol. 8, pt. 2, pp. 207-227, pls. 10 and 11
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Planularia cuneata Morton, 1842 † (original description)
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