J. Selwyn Turner; The type-species of Aganides, Clymenia, and Cyrthoceratites. Geological Magazine ; 99 (2): 183–184. doi:
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Notes are given which trace and clarify the type species of Aganides de Montfort, 1808, Clymenia Muenster, 1834, and Cyrthoceratites d'Archiac and de Verneuil, 1842.
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