NO. 1521. 



MEASUREMENTS OF CRANIAL FOSS^l—HRDLICKA. 



215 



Breadth, rna.vimum, of frontal region, renlralli/, compared ivlth breadth maximum of the 



skull dorsally. 



Fetuses and voung, both sexes: 



White, bfaehycephalic (6) SO. 9 



Colored — i. e., negro and negro-white — 



Brachj'cephalic (10) 80. 7 



Dolicho- and mesocephalic (20) ,v2. 3 



Apes — 



1 chimpanzee 79.8 



orangs 77. 8 



4 gibbons 79. 2 



Monkeys — 



1 Macacus pelops 79. 4 



1 Aloudtd SOI iculn 78. 6 



1 CInis h i/i>(il> iicii.<; 79. 3 



I L< iiiin- r.iriiix 80. 5 



1 ( 'i:<ii.-< 11 III, linui ii.i 75. 3 



At tir.st .sight the above data are quite striking, but it must be 

 reinein])erpd that the frontal bi'eadth has been compared w'ith the 

 dorsal breadth of the skull, which varies in the ditierent series. The 

 proper way would be to compare the former with the greatest ventral 

 l)readth in all the skulls, but the latter measurement is difficult and in 

 the material here utilized was not always possible. 



The thickness of the skull is very iieai'ly the same in human fetuses 

 and young, in gibbon.s, alouata, cebus, and lemur, and the data obtained 

 on these specimens are directly comparable. 



In the orangs and chimpanzees the thickness of the two parieties at 

 the location of the greatest breadth of the skull exceeds that in the 

 human young bv al)out 5 mm., in the negro by about 7 mm., in the 

 Indian and white male by about 6 mm., and in the white female by 

 about o mm. Reducing the greatest external t)readth of the skulls in 

 question by these figures and comparing the greatest internal frontal 

 breadth with the remaining proportions, we obtain the following data, 

 which are quite suitable for comparisons with the human young, 

 gibbons, and other above-named species. 



