. Bulletin of the British Museum (Natural History), Geology. . Fig. 40. Pluriarvalium osmingtonense Sarjeant. Two damaged specimens, showing how the anterior portion of the ventral surface is apparently lost in archaeopyle forma- tion. Left, ventral view ; right, dorsal view. x c. 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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