. Bulletin of the Natural Histort Museum. Geology series. BARYONYX WALKERI 17 mx. C iFig. 3 Baryonyx walkeri, holotype, BMNH R9951; left maxilla. A, lateral view: B, medial; C, anteroventral. x Dortion bearing four prominent longitudinal ridges. Just below the iorsal margin of the medial face lie two large, deep fossae, one ibove the septum between the S"* and 4* alveoli and the other above he 6"' alveolus. Comparison with other theropod skulls suggests that hese may have housed maxillary sinuses. 1 The most anterior part of the medial face is in fact an anteriorly Bir
. Bulletin of the Natural Histort Museum. Geology series. BARYONYX WALKERI 17 mx. C iFig. 3 Baryonyx walkeri, holotype, BMNH R9951; left maxilla. A, lateral view: B, medial; C, anteroventral. x Dortion bearing four prominent longitudinal ridges. Just below the iorsal margin of the medial face lie two large, deep fossae, one ibove the septum between the S"* and 4* alveoli and the other above he 6"' alveolus. Comparison with other theropod skulls suggests that hese may have housed maxillary sinuses. 1 The most anterior part of the medial face is in fact an anteriorly Birected flange (on to the lower half of which run the longitudinal idges already mentioned). The anterior tip of this flange articulates vith a notch on the lateral surface of the anterior process of the )alatine (). The anterodorsal border of the flange forms the nedial wall of the internal portion of the subnarial canal. Seen from below, the anterior/ventral surface of the maxilla is of nore or less uniform width. The lateral half of this is occupied by the lental alveoli; the medial half consists posteriorly of the stout ounded ridge referred to above, tapering forwards slightly; anterior 0 the level of the 4'*" maxillary tooth this ridge tapers further into the lin medial flange and a less prominent shelf on the inner wall of the lange immediately bordering the medial walls of the alveoli. Also n the medial wall of the flange, behind the shelf, a bony wall urrounds what may well be another maxillary sinus. On the anterior surface of the rectangular peg is a vertical depres- lion, behind which is the first maxillary alveolus. Altogether there |re seven alveoli in the preserved portion of the maxilla; the first four :^e almost contiguous, separated from each other by only a thick bny wall, but from no. 4 backwards they are more widely spaced. .Iveoli nos. 2, 3 and 4 are the largest; nos. 1, 5 and 6 are smaller, no. 7 smaller still. The alveoli are subcircular; no. 4 co
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