34 Field Columbian Museum — Anthropology, Vol. II. 



for the entire series 56. This gives a face which is not extremely 

 broad nor extremely narrow, and which may be properly char- 

 acterized as mesoprosopic. It was possible to compute the total 

 facial index in six males and five females. The results are: For the 

 males, average 91, maximum 96, minimum 88; for the females, aver- 

 age 89, maximum 95, minimum 84. The average for both sexes is 

 90, which again comes within the mesoprosopic division. 



In determining the gnathic index I have compared the basi- 

 spinal to the basi-alveolar length after the method of Prof. Flower,* 

 except, it will be noted, that I have used as the standard the basi- 

 spinal rather than the basi-nasal length. This gives a more accurate 

 expression of what Topinard calls the true prognathism, or alveo- 

 subnasal prognathism. The data are present, however, in the. table 

 to compute the basi-nasal basi-alveolar relationship. As the basi- 

 spinal length is taken as 100, the higher the index the greater is the 

 basi-alveolar length, and so, consequently, the greater is the amount 

 of prognathism. The average index for the males is 107, minimum 

 104, maximum in; for the females the average is no, minimum 106, 

 maximum 117. The mean general gnathic index for the entire series 

 is 108; this represents an extreme amount of prognathism which is 

 probably not surpassed by that of any other race. Furthermore, this 

 does not represent the full prognathic character of this series of 

 crania, for it leaves out of consideration the teeth, which in many 

 cases project forward at an angle of 2o°-40°. 



Norma Verticalis. — The skulls are, as a rule, long and narrow, 

 with compressed frontal region, fairly well developed parietal emi- 

 nences which are usually situated pretty well back. There is a 

 marked difference between the two sexes in the dimensions. Thus, 

 the average maximum length in the male is 182 mm., in the female 

 the average is 171 mm. The longest cranium measured is 191 mm., 

 that of a male; the shortest is 164 mm., belonging to a female. The 

 average maximum width of the male crania is 131 mm., of the female 

 127 mm. The range of variation for the entire series is from 118 mm. to 

 140 mm. Adopting the classification of Prof. Flower for the ceph- 

 alic index, it appears that the male crania are, without a single 

 exception, dolichocephalic, having a mean index of 71, with a maxi- 

 mum of 74 and a minimum index of 65, the series as a whole being 

 remarkably uniform. There is even more uniformity in the indices of 

 the seven females, with the exception of one skull which has the low 

 index of 65. The other six range from 72 to 77, and average 75, and 



* '• On the Osteology and Affinities of the Natives of the Andaman Islands." Journal of An- 

 throp. Institute, Nov., 1S79. p. 12. 



