. Bulletin of the British Museum (Natural History), Geology. 3° CLASSIFICATION OF BABOONS spino- and acromio-deltoid muscles agree with the condition in living genera. The acromion itself is rather short and stout, and also oriented as m the terrestrial rather than the arboreal modern genera. The neck is rather broad, indicating a stout and heavy build. The areas of origin of the round and aponeurotic portions of M. triceps, caput longum, are strongly-marked. The spino-glenoid notch is deep. The humerus is represented by eleven specimens, of which seven are new, and which between them represen
. Bulletin of the British Museum (Natural History), Geology. 3° CLASSIFICATION OF BABOONS spino- and acromio-deltoid muscles agree with the condition in living genera. The acromion itself is rather short and stout, and also oriented as m the terrestrial rather than the arboreal modern genera. The neck is rather broad, indicating a stout and heavy build. The areas of origin of the round and aponeurotic portions of M. triceps, caput longum, are strongly-marked. The spino-glenoid notch is deep. The humerus is represented by eleven specimens, of which seven are new, and which between them represent the whole bone (Plate iic, d and e): 1. Part of the proximal end of a right humerus, from the surgical neck to the level of the midpoint of the delto-pectoral crest. An isolated head with part of the lesser tuberosity makes a good fit with the posterior part of its broken proximal surface. 2. Part of the shaft of a left humerus, showing the anterior surface in the region of the deltoid insertion. 3. M 18791. Part of a left humeral shaft, from just above the midpoint of the insertion of M. teres major to well below the delto-pectoral crest. 4. A fragment of a left shaft, almost exactly as the last, but less complete Fig. 4. Anterior aspect of humerus, showing dimensions quoted in Table 6. A. Horizon- tal plane at most proximal point of diaphysis. B. Plane at midpoint of insertion of M. teres major tendon. C. Plane where deltoid crest crosses anterior margin. D. Plane immediately proximal to tubercle of insertion of M. extensor radialis 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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