. Bulletin of the British Museum (Natural History), Geology. . Fig. 13 Eight specimens showing the range of variation in Orbirhynchia mantelliana, from the Lower Chalk, rhotomagense Zone, Folkestone, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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