Biology Reference
In-Depth Information
Figure 8. Figure 19 from Dart's unpublished manuscript (Dart 1929), with the
legend “Dioptographic tracing of skull & endocranial cast of
Australopithecus
to illustrate their main morphological features.” Dart indicated sutures with
the internal dashed lines. Sulcal identifications are in Dart's handwriting. Of
these identifications, only
L
and
ts
were published in Dart's original paper.
Compare with figure 7. Reproduced with permission of the University of
Witwatersrand.
awkward, because he continued to portray the actual suture as the
lunate sulcus and added an approximately 14-mm dashed line to repre-
sent the suture right behind it. Furthermore, his illustration has part of
the lunate sulcus on top of the suture, which is anatomically backward.
(Sutures appear more superficial to sulci on endocasts.) As far as I know,
Dart's figure 19 is the only illustration in which he ever portrayed a
lambdoid suture and, further, the only one in which he illustrated both
a lambdoid suture and a lunate sulcus. This figure is especially poi-
gnant, because it shows that Dart was well aware that he had a lunate
sulcus/lambdoid suture problem and tried to solve it years before it was
addressed in a publication by Le Gros Clark and his colleagues.
19
