REMAINS, FROM ARKANSAS AND LOUISIANA. 195 
Av alveo- 
: | Average Av height ізсіз! ang! ат angie 
Bie ell аи ber of жЕ. ке. Eaton basion-middie of away the X "t EN =a ° | (between 
B ) | speci- s "d veolar s'on-nasion nasal notches point to middie of basion = basion-alveolar 
mens | Point diameter diameter diameter nasal notches olar point- point- 
nasion lines) таза! notches 
| lines) 
zs Males. Е ст. ет. | em, degrees degrees 
Louisiana 7 105 (10,0-11.0) 70.6 (10.4-111) 9.3 (9,0-0,8) | 2.5 (2.1-2.75) ¡70 (66 73) |55,5 (48-61) 
Arkansas | | | 
Boytt's ` Field 10 170.2 (9.8-10.7) 110.4 (10.0-11.0) 9.7 (8.8-9.7) | 2.2 (2.05-2.4) 77 (66-74) 53 (48-67) 
Arkans 
и and Greer cometarios | 1 10.7 ILU иды ы BA rias Bid тылы н ДЫМ Қ, PARRA HI. o ioca 
Arkansas 
COMPARISON OF AVERAGE MEASUREMENTS AND INDICES RELATING TO PROGNATHISM 
| 
ша | ¡Average basi. | 
Drew sail Mississippi counties 5 |9.95 (9.5-10.5) |10.35(10.0-10.7) 8.9 (8.5-0.5) | 2.3 (2.0-2.5) 71 (67-73) 57 (56-58) 
Females. 
Louisiana 6 19.7 (9.3-10.2) 9.8 (9.5-10.7) | 8.5 (8.3-8,9) | 2.2 (1.95-2.4) 70 (66-75) |52 (49-57) 
Arkansas: | 
Boytt's Field | 4 ? 9,8 (9,5-10.2) ? ? ? 
Arkan 
| 
| 
Qə 
| | | 
Р 
1 | 
Manara dil Greer арыны 4 |10. (9.4-10.6) 10.06 (9.9-10.2) 9.0 (8.5-9.3) | 2.3 (1.7-2.9) 68 (64-73) ей (51-56) 
Arkansas 
Drew and Mississippi counties 9.6 (9.4-10.0) | 9.7 (9.5-9.8) | 8.4 (8.3-8.6) |2.0 (1.85-2.15) 69 (66-71) 57 (49-53)* 
* Two specimens. 
This similarity extends, in all probability, to the Arkansas skulls collected in 1908, 
though the small number of specimens in the latter collection give somewhat un- 
equal averages. 
The diameter frontal maximum, which can be considered in only the un- 
deformed specimens, averages perceptibly less in the female crania from both 
Louisiana and Arkansas than it does in the male skulls, but this is due merely 
to the smaller size of the female head. The average percental relation between 
the smallest and greatest frontal diameters is alike in the two sexes, though there 
appears a slight tendency toward a lower index in the female crania. Тһе propor- 
tion between the two measurements is also very similar in the different localities. 
Foramen Magnum.—In all the groups of skulls here considered the mean 
diameter of the foramen magnum shows a higher average in the males than in the 
females; and in both sexes it is slightly higher in the Louisiana crania than in 
either of the groups from Arkansas. So far as the sexes are concerned, these dif- 
ferences are due probably to the difference in stature, for this factor has a decided 
effect on the size of the foramen. 
Lower Jaw.—In this series of skulls again, as in that from Arkansas, the lower 
jaw is of moderate dimensions throughout; yet the averages indicate that it is 
slightly higher than the lower jaws from Arkansas. 
Both the breadth and the height of the lower jaw are, as may be expected, 
perceptibly less in the females than in the males, but there are individual ехсер- 
tions in both sexes. 
