. The brain in hominid evolution. Human evolution; Brain; Fossil hominids. % t. â 7 289 530 Figure 18: The biparietal partial endocast and the total endocast of Olduvai hominid 5 (type specimen of Australopithecus boisei). based on Dubois's figure of 935 , came to per cent. Since then, I have had the opportunity of reestimating the total volume of the Trinil specimen (see chapter on Homo erectus, p. 81): it amounts to 854 , and so the new percentage for Trinil is (Tobias 1967a, 1968b). This new result yields a ratio of biparietal to total endocast volume that r
. The brain in hominid evolution. Human evolution; Brain; Fossil hominids. % t. â 7 289 530 Figure 18: The biparietal partial endocast and the total endocast of Olduvai hominid 5 (type specimen of Australopithecus boisei). based on Dubois's figure of 935 , came to per cent. Since then, I have had the opportunity of reestimating the total volume of the Trinil specimen (see chapter on Homo erectus, p. 81): it amounts to 854 , and so the new percentage for Trinil is (Tobias 1967a, 1968b). This new result yields a ratio of biparietal to total endocast volume that ranges from per cent to per cent. When the original list of percentages was applied to H. habilis, estimates were obtained that ranged from to , with central values of and (Tobias 1964). When the revised list of percentages, modified by the new value for Trinil, is applied to H. habilis, somewhat lower values are obtained: the range of estimates now becomes to (Figure 17), with a central value of 657 instead of the former estimate of 675 to 680 (Tobias 1968b, p. 83). The new revised estimate of 657 for the type specimen of H. habilis exceeds my new estimate of the A. africanus mean of 494 by 163 , or This value is extremely high and confirms that the estimated cranial capacity of the type specimen of H. habilis is significantly greater than the mean capacity of the available sample of A. africanus capacities. If we compare the value of 657 with Robinson's proposed new mean for A. africanus, namely 430 , the excess is 277 or (by my estimate, , = ) or (by Robinson's 67 &. 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 Tobias, Phillip V. New York : Columbia Universi
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