. Bulletin of the British Museum (Natural History) Geology Supplement. . Fig. 23. Transverse serial sections of Acanthothiris cf. costata Orbigny. Bathonian/Cal- lovian. Middle Chanaz Beds. Pugieu (Ain), France. (X4).. 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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