Table 12: Symmetry and skewing of samples of hominoid 

 cranial capacities 



Highest oltset ved value 



Standardized 



Spet ies and sample 



GIBBON 



(Hylobates lar) 

 Males (n = 95) 

 Females (n = 85) 

 Combined males and females (n = 180) 



GIBBON 



(Hylobates agilis) 



Combined males and females (n = 21) 



SIAMANG 



(Symphalangus syndactylus) 



98.8 



10.32 



120.0 



+21.1 



+2.(15 



Hylobates lar from a very limited district in northern Thailand. The 

 data, as reduced by my research assistants, Miss C. J. Orkin, C. Block, and 

 M. Hockman, are recorded in Tables 4, 9, and 12. Table 12 shows a 

 slightly positively skewed distribution for male H. lar and a very slightly 

 negatively skewed, or virtually symmetrical, distribution for female H. lar. 

 Of the various other subsamples of gibbons cited by Oppenheim 

 (191 1-1912) and Schultz (1933), only that of H. agilis is perhaps big enough 

 to be cited in my tables. Oppenheim recorded the mean and range for 

 8 specimens of unknown sex, and Schultz the raw data for 8 males and 



^ 52 



