. Journal of anatomy . ls on or below the sub-cerebralplane; in the Madagascar skull just figured, and in that of paleolithic man,the glabella and supra-orbital ridges rise from 5 to 15 mm. above thisplane, but in the anthropoids it is placed at a much higher level, 30 to 35mm. above the sub-cerebral plane in adults. But in the young this is notso; the glabella occupies a lower position, nearer to that of man. Fromfisfs. 5 and 6 it will be seen that the face covers the frontal lobe and that Description of a New Craniometer, etc. 259 the part represented by the forehead of man is usurped by the
. Journal of anatomy . ls on or below the sub-cerebralplane; in the Madagascar skull just figured, and in that of paleolithic man,the glabella and supra-orbital ridges rise from 5 to 15 mm. above thisplane, but in the anthropoids it is placed at a much higher level, 30 to 35mm. above the sub-cerebral plane in adults. But in the young this is notso; the glabella occupies a lower position, nearer to that of man. Fromfisfs. 5 and 6 it will be seen that the face covers the frontal lobe and that Description of a New Craniometer, etc. 259 the part represented by the forehead of man is usurped by the supra-orbital ridges in the adult anthropoid. In the anthropoid skull, when oriented in the sub-cerebral plane, thebregma is the highest point—a feature never observed in man. Thecalottal heights of the two specimens here figured are: 54 for the orang,60 for the chimpanzee. Yet the height as measured from the auditorymeatus is practically equal—68 mm. in the orang, 69 in the chimpanzee. ;!i:sip:«.i;i1^^*. Fig. 5.—Craniometric drawing of the skull of an adult female orang. The orienting rod is repre-sented within the skull—tlirust in 90 mm., and resting on the presphenoid. The vertical lineis drawn through the anterior polar point. The degree of prognathism can be measured with accuracy if thevertical polar line be used as a base. The glabellar projection in the orangis only 12 mm., it is 25 ram. in the chimpanzee; the nasion 17 in tlieorang and 22 in the chimpanzee; the nasal tip 33 in the first, 27 in thesecond; the nasal spine 59 in the first and 38 in the second; the alveolarpoint 87 in the first and 57 in the second. The projection in the chimpanzeeis a frontal projection, that in the orang a maxillary. It will also be seen 260 I)r Arthur Keith that while the maximal lengtlis of the skull in the two specimens comparedare 116 : 141, the maximal length of the brain is 99 : 111. The differenceis chiefly in the skull, not in the brain. Age Chaxges in Anthropo
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectanatomy, bookyear1867
