Foraminifera source details
Crick WD, Sherborn CD (1892) On some Liassic Foraminifera from Northamptonshire Part II – The Leda-Ovum Beds of the Upper Lias. Journal of the Northamptonshire Natural History Society 7: 67–73.
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Crick WD, Sherborn CD (1892) On some Liassic Foraminifera from Northamptonshire Part II – The Leda-Ovum Beds of the Upper Lias. Journal of the Northamptonshire Natural History Society 7: 67–73.
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Cristellaria opercula Crick & Sherborn, 1892 † accepted as Astacolus opercula (Crick & Sherborn, 1892) † (original description)