260 AFRICA
seen on the L, appears that petrosal was very short and
angled forward from the tubular ectotympanic. As
seen on the L, jugular foramen was of moderate size,
pointed forward. Basiocciput very broad, flat; probably
was thick, tapering s/i posteriorly to foramen magnum.
Foramen magnum apparently not very broad; rim
blunt. Occipital condyles relatively short and down-
wardly arced, lying quite far forward along foramen
magnum. As seen through breaks on the L, sphenoid
sinus extended quite far laterally, to near peak of
orbital cone and as far posteriorly as foramen ovale.
Occipital quite broad and tall. Sagittal suture rises
somewhat steeply from asterion; apparently peaked at
lambda. Occipital plane as wide as it is tall; appears to
bulge posteriorly (this impression largely created by
short, essentially horizontal plane that undercuts oc-
cipital plane across nuchal region in shallow down-
ward curve from side to side). Rest of nuchal plane
may have angled forward quite sharply. These surfaces
very weathered, but appears that occipital region was
quite smooth, and that nuchal region lacked much
scarring except for shallow bilateral pits just posterior
to rim of foramen magnum. These pits separated by
very short, wide, low external occipital crest.
Interndy, frontal lobes extend quite far over orbital
cones. Superior sagittal sinus not visible. Grooves for
middle meningeal arteries quite deeply impressed; do
not arborize very much. Impressions of occipital lobes
lie right over nuchal undercutting. As seen on the
R, cerebellar lobes face straight down. Single sigmoid
sinuses cross occipitomastoid suture just below asterion,
just missing parietal. Transverse sinuses not expressed.
On both sides, region of arcuate eminence low, at most
being slightly elevated over superior semicircular canal.
Subarcuate fossae not closed over. Sub-subarcuate fossae
absent. Trace of superior petrous sinus undeterminable.
Sagittal and lambdoid sutures broadly and shal-
lowly denticulate, except just behind glabella where
sagittal suture appears to have been straight. Coronal
suture appears to have been segmented, with broadly
undulating part adjacent to glabella, becoming more
finely denticulated toward temporal line, after which it
is invisible. As a suture, sagittal looks quite normal but
runs posteriorly in an unusual trough (pathology?).
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Department of Palaeontology, The Natural History
Museum, Cromwell Road, London SW7 SBD, UK.