. Bulletin of the British Museum (Natural History), Geology. G H I Fig. io. Diagram illustrating the variation in numbers and distribution of pits in the anteromedian portion of the fringe in Bettonia chamberlaini (Elles) from the type locality. The diagrams are arranged showing a progressive increase in the number of anterior ad- ventitious pits (shown as solid circles) present external to the Et arc. The median pit of the Ei arc, at times displaced laterally, is arrowed. All diagrams x 7. A— It. 2820 (PI. 13, fig. 7); B—BU 261a (PI. 12, fig. 5); C—It. 2821 (PI. 13, fig. 6); D— BU 261b (PI. 1

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. Bulletin of the British Museum (Natural History), Geology. G H I Fig. io. Diagram illustrating the variation in numbers and distribution of pits in the anteromedian portion of the fringe in Bettonia chamberlaini (Elles) from the type locality. The diagrams are arranged showing a progressive increase in the number of anterior ad- ventitious pits (shown as solid circles) present external to the Et arc. The median pit of the Ei arc, at times displaced laterally, is arrowed. All diagrams x 7. A— It. 2820 (PI. 13, fig. 7); B—BU 261a (PI. 12, fig. 5); C—It. 2821 (PI. 13, fig. 6); D— BU 261b (PI. 13, fig. 1); E—It. 2813 (PI. 12, fig. 7); F—BU 264 (PI. 13, fig. 2); G— BU 262 (PI. 13, fig. 4); H—It. 2817 (PL 12, fig. 2); I—It. 2819 (PI. 13, fig. 3).. 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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