Müller, J. (1851). Monographie der Petrefacten der Aachener Kreideformation. Zweite Abtheilung. Henry & Cohen, Bonn, 88 pp. + pls. 3–6. page(s): 17, pl. 3, fig. 21 [details]
original descriptionMüller, J. (1851). Monographie der Petrefacten der Aachener Kreideformation. Zweite Abtheilung. Henry & Cohen, Bonn, 88 pp. + pls. 3–6. page(s): 17, pl. 3, fig. 21 [details]
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