. Bulletin of the British Museum (Natural History), Geology. AUSTRALIAN ARTHRODIRES 281 The anterior face of the mesial process is that in contact with the anterior superognathal (cf. Heintz, 1932: 148, text-figs. 28, 29). It is roughly triangular, narrowing and sloping gently inwards and downwards to the origin of the blade. The broad upper part is more or less flat, but a groove develops below along the front edge, which is straight but somewhat sloping. MsP. Text-fig. 31. Left posterior superognathal of undetermined brachythoracid, inner view. , X5. Text-fig. 32. The same, outer view
. Bulletin of the British Museum (Natural History), Geology. AUSTRALIAN ARTHRODIRES 281 The anterior face of the mesial process is that in contact with the anterior superognathal (cf. Heintz, 1932: 148, text-figs. 28, 29). It is roughly triangular, narrowing and sloping gently inwards and downwards to the origin of the blade. The broad upper part is more or less flat, but a groove develops below along the front edge, which is straight but somewhat sloping. MsP. Text-fig. 31. Left posterior superognathal of undetermined brachythoracid, inner view. , X5. Text-fig. 32. The same, outer view. Text-fig. 33. Palatal (dorsal) surface. Text-fig. 34. Direct oral (ventral) view. Text-fig. 35. Front view. (For explanation of lettering see pp. 303-304.) The corresponding face on the outer side has decayed (Text-figs. 32, 35) except for a narrow vertical selvage along the front margin and a fragment below. The form of this face is uncertain, but the anterior selvage is transverse to the length of the bone and suggests that the upper part was rounded, although the fragment below shows a vertical division into two facets. The whole face is separated behind from the body of the plate by a low, nearly vertical ridge which runs to meet the median and mesial ridges in a point at the start of the blade. GEO. I, 9. K k. 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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