. Bulletin of the Natural Histort Museum. Geology series. <1g. 37 Baryonyx walkeri, holotype, BMNH R9951: right ilium. A. posterior process in posterior view; B, same, ventrolateral; C. ischiadic peduncle, lateral; D, pubic peduncle, lateral, x The ischiadic peduncle is shorter and much more slender. Its 'irticular surface is much smaller, semicircular with its medial corner extended to a point (marking the sharp medial edge of the acetabu- um) and extremely rugose. The supra-acetabular crest is well ieveloped and has a sharp lateral edge. 'UBIS (Fig. 39A). One large elongated
. Bulletin of the Natural Histort Museum. Geology series. <1g. 37 Baryonyx walkeri, holotype, BMNH R9951: right ilium. A. posterior process in posterior view; B, same, ventrolateral; C. ischiadic peduncle, lateral; D, pubic peduncle, lateral, x The ischiadic peduncle is shorter and much more slender. Its 'irticular surface is much smaller, semicircular with its medial corner extended to a point (marking the sharp medial edge of the acetabu- um) and extremely rugose. The supra-acetabular crest is well ieveloped and has a sharp lateral edge. 'UBIS (Fig. 39A). One large elongated fragment, 277 mm long, is )roken at one end and another fragment, 248 mm long, at both ends; )ne broken end on each resembles the other so much in size and hape that they are almost certainly parts of the same element, not mmediately adjacent to each other but separated by a gap of ndeterminate width. Both are stout shafts produced on one side into 1 broad flange that could well represent part of one half of the 'pubic ipron', concave on one side and flat on the other. The fragment with ji complete end is probably the distal part of the left pubis, the other ragment is probably the central part of the shaft of the same bone. \ third fragment, 251 mm long, has the shape of one end (presumed Jistal) very like that of the proximal end of the central portion and is ikely to be a more proximal piece of the same element. The lengths if the three pieces added together total 776 mm, and we estimate the ;ngth of the entire pubis to have been about 1000 mm; this is not nreasonable when compared with the overall length of the entire lium (about 820 mm). The position of all three pieces on the block 'Ian (Fig. 48) is fully in accord with this identification. The acetabular portion of the left pubis is missing entirely. The roximal fragment of the shaft has a thick, rounded lateral edge; the ledial border of this proximal part is atrue edge, slightly downtumed. he medial half of the dorsal
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