NO. 1495. 



OBSERVATIONS ON ORANG SKULLS— HRDLICKA. 



545 



The data show, in confonriity with those on capacit}', that in orang-s 

 the cranial vault g-rows veiy little after the eruption of the third per- 

 manent molars. The cranial index in half of the males and nearly all 

 the females is moderateh' brachjcephalic, in the other half of the males 

 and one female mesocephalic. The predominance of moderate ))rach3'- 

 cephaly agrees with former observations. In the males the index 

 appears to decrease somewhat with growth, which is largel}" due to 

 the increasing thickness of the vertical occipital ridge; in the females 

 such diU'erence is not noticeable. The height shows a reciprocal com- 

 pensation with the breadth. On the average, the female skull is both 

 absolutely and relativel}' lower than that of the male. (Height-length 

 index, male 81, female TS; Height-breadth index, male H9, female 1>6.) 

 The range of variation, except with the cephalic index in the males, 

 can not be regarded as excessive. 



MEASUREMENTS OF THE FACE. 



The lower jaw attains in tlie males remarkable proportions, showing 

 at the same time more variation than does that of the females. The 

 height of the svmphysis, from the highest point of the alveolar process 

 in the median line perpendicularly downward," measured as follows: 



Some of these mandibles are really very large; thus. No. 14219^ 

 measures, in line with the border of the alveolar process, 16.4 cm. in 

 length with the vertical ramus 10.5 cm. high and 6.15 cm. in minimum 

 breadth; and it weighs, less both canines and three incisors, 344 grams. 



The data concerning the angle of the lower jaw were given before. 

 (See under sex.) 



Two measurements were taken on the upper portion of the 

 face, namely, (1) the height from the lowest point on the upper 

 alveolar border to the highest point of the naso-frontal suture, 

 and (2) the diameter bizygomatic maximum. Both of these measure- 



« On Broca's mandibular goniometer. 

 Proc. N. M. vol. xxxi— 06 36 



