-----------------------+----------+-----------+-----------+----------- | Males | Females -----------------------+----------+-----------+-----------+----------- | Narrowest| Broadest| Narrowest| Broadest | skulls| skulls| skulls| skulls | (C. I.|(80.6-83.1)|(70.3-74.2)|(80.9-83.8) |70.7-73.5)| | | -----------------------+----------+-----------+-----------+----------- Length | 5.68| 5.58| 5.52| 5.20 | | | | Breadth | 6.83| 6.77| 6.66| 6.36 | | | | Index | _83.2_| _82.4_| _82.9_| _82.7_ | | | | Mean diameter | 6.26| 6.18| 6.09| 5.78 | | | | Mean cranial diameter | | | | (cranial module) of | 15.61| 15.49| 14.97| 14.73 same skulls | | | | | | | | Percentage relation | | | | of mean dental arch | | | | diameter to the mean | _40.1_| _39.8_| _40.7_| _39.2_ diameter of the skull | | | | | | | | Length of same skulls | 19.21| 18.10| 18.35| 17.25 | | | | Percentage relation of | | | | length of dental arch | _29.5_| _30.8_| _30.1_| _30.1_ to that of skull | | | | -----------------------+----------+-----------+-----------+----------- The above figures show several conditions. The first is that the arch is quite distinctly larger in the narrow than in the broad skulls in both sexes. The second fact is that the skull (vault) itself is slightly larger in the narrow-headed. The third is that the length of the arch is somewhat greater in the narrow and long skulls than it is in the broad and shorter, relatively to the skull size. The fourth is that there appears a close correlation, more particularly in the females, between the length of the arch and that of the skull. FOOTNOTES: [155] See Bull. 62, Bur. Am. Ethn., and writer's Report on an Additional Collection of Skeletal Remains from Arkansas and Louisiana, published with Clarence B. Moore's report on the Antiquities of the Ouachita Valley, Philadelphia, 1909. THE BASION-NASION DIAMETER