105 

 Gnathic Index. 



In six specimens which we have measured we fipd the 

 gnathic index to be 106, classing the skulls as prognathous. 

 The male index, 107*5, is greater than the female, 102'7. 

 The variation is 9. Flower, in 11 specimens, finds an average 

 index of 103'3 The two Cambridge specimens measured 

 give an average of 108*1. These figures combined give an 

 average gnathic index of 105*8, which classes the Tasmanian 

 skull as prognathous. 



The male palate, with an average index of 118, is broader 

 than the female, with an average of 111*5. The total average, 

 1146, classes these specimens as mesuranic. The two 

 Cambridge specimens which were measured give an average 

 of 1145. These averages combined give an index of 114*55, 

 which classes those Tasmanian skulls of which we have 

 measurements as mesuranic. 



Frontal Index. 



No. Average. Minimum. Maximum. 



Male 6 67*9 65*4 70-4 



Female 6 667 62*9 73*5 



Total 12 67-3 629 73-5 



This index is fairly constant, averaging 67'9 in the males, 

 and 667 in the females, or 67*3 in both sexes. The greatest 

 variation is 10*6. Broca finds in eight Tasmanian crania an 

 index of 67*0. In deducing this index from Topinard's 

 measurements in Ling Roth's " Tasmanians," we find it to be 

 65*7 in the males and 70*2 in the female. These figures 

 combined give an average index of 67*4, so that this index is 

 fairly constant in the skulls of whose measurements we have 

 a record. 



