. Bulletin of the British Museum (Natural History), Geology. EAST AFRICAN CHALICOTHERES 195 posterior part of M2. Unfortunately the known skulls of C. grande are so badly crushed that the exact position of the border of the orbit is uncertain. The distance between the orbit and the infraorbital foramen appears, however, to be greater in C. rusingense than in either C. grande or C. brevirostris. Mandible. (Text-figs. 8, 9 ; Table VII.) F 3608 is the only specimen in which more than a fragment of the mandible is preserved. It consists of both horizontal rami, but the posterior part of the mandib
. Bulletin of the British Museum (Natural History), Geology. EAST AFRICAN CHALICOTHERES 195 posterior part of M2. Unfortunately the known skulls of C. grande are so badly crushed that the exact position of the border of the orbit is uncertain. The distance between the orbit and the infraorbital foramen appears, however, to be greater in C. rusingense than in either C. grande or C. brevirostris. Mandible. (Text-figs. 8, 9 ; Table VII.) F 3608 is the only specimen in which more than a fragment of the mandible is preserved. It consists of both horizontal rami, but the posterior part of the mandible has been broken off on both sides. R shows the region of the symphysis. The ramus is moderately deep, its depth increasing posteriorly. Below the molars the rounded lower border is very slightly concave in lateral view, falling and be- coming sharper behind M3 to indicate the angular process (most of which is missing). The lateral surface below the teeth is nearly flat, but shows a weak longitudinal groove about 14 mm. above the lower border. This groove fades out below the premolars, where there is a slight convexity. The masseteric fossa is very flat and hardly noticeable. The coronoid process appears to be inclined at an angle of 45 ° to the alveolar border. Internally, the ramus is moderately convex below the molars; about 15 mm. above the lower border there is a slight groove, presumably for the mylohyoid muscle. The mandibular foramen is low, its lower border being 22 mm. below the level of the alveolar border. The pterygoid fossa is very 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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