. Bulletin of the British Museum (Natural History), Geology. 92 P- J- ANDREWS The alveolar process of the maxilla is fairly robust. The floor of the maxillary sinus is at about the level of the tips of the molar roots so that the latter do not push up into the floor of the sinus. Specimen RU 2036 is exceptional in having one fairly deeply excavated region of the floor of the sinus above M1. No specimen is complete enough to measure, but it appears that the sinus is restricted laterally. The tuberosities of the alveolar process vary from short in M 32363, possibly a female, to long in M 14084,
. Bulletin of the British Museum (Natural History), Geology. 92 P- J- ANDREWS The alveolar process of the maxilla is fairly robust. The floor of the maxillary sinus is at about the level of the tips of the molar roots so that the latter do not push up into the floor of the sinus. Specimen RU 2036 is exceptional in having one fairly deeply excavated region of the floor of the sinus above M1. No specimen is complete enough to measure, but it appears that the sinus is restricted laterally. The tuberosities of the alveolar process vary from short in M 32363, possibly a female, to long in M 14084, possibly a male, but in neither case is it possible to make an accurate measurement. The greater palatine foramen is opposite M3 in both cases. The zygomatic process of the maxilla is above M1/2 in all specimens except the immature maxilla RU 2036, in which it is further forward above M1. There is considerable variation in the height of the zygomatic process; it is low in RU 2036, but this is to be expected in an immature individual; in the two adult speci- mens on which it is possible to measure this dimension accurately values of 7-1 mm on a possible female (M 32363) and 10-4 mm on a possible male (M 14084) were obtained. The palate is long and narrow. Clark & Leakey (1951 : 16, 24) estimated palate breadths at M1 for M 14084 and M 32363 both at 24-0 mm; I agree with the former estimate but have a value of 21-0 mm for the latter. By the time it was adult, RU 2036 would probably have had a palate breadth slightly greater than 21-0 mm. Mandible (Table 2, p. 136-7). The mandibular symphysis is buttressed by a superior transverse torus. An inferior torus is not developed on any specimen, but the medial surface below the superior torus usually passes vertically downwards and only a little anteriorly. In one case (RU 1728) it passes a little posteriorly so that the most posterior part of the symphysis is near the base. The genial fossa is shallow and has a number of genial pits
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