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Calcisphaera laevis Williamson, 1880

Image of Parathuramminida

Description:

Williamson, W. C. (1880). On the Organization of the Fossil Plants of the Coal-Measures. Part X. Including an Examination of the Supposed Radiolarians of the Carboniferous Rocks. Philosophical Transactions of the Royal Society of London. 171(0): 493-539., available online at https://archive.org/details/philtrans04248024
page(s): p. 521 pl. 20 fig. 70

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