196 REPORT ON AN ADDITIONAL COLLECTION OF SKELETAL 
FRONTAL BONE—FORAMEN MAGNUM—AVERAGE PROPORTIONS AND THEIR COMPARISON 
Num- 
ber o 
Sex and Locality 
Males 
Louisiana 17 
Arkansas: 13 
Boytt’s Field 
Arkansas: 
Menard and Greer! 3 
cemeteries 
Arkansas : ; 
Drew and Missis-| 23 
sippi counties 
Females 
Louisiana 17 
Arkansas : 10 
Boytt's Field 
Arkansas : 
Menard and Greer, 7 
cemeteries 
Arkansas : 
Drew and Missis-| 13 
sippi counties 
Average diameter 
speci- ا‎ улва. 
mens 
ст. 
9.6 (8.5—10.2) 
9.6 (8.7–10.2) 
10.0 (9.8-10.15) 
9.45 (8.4-10.7) 
9.4 (8.3-9.9) 
9.3 (8.6-10.2) 
9.2 (8.8-9.85) 
9.15 (8.1-9.5) 
3 
1 
J1 
6 
3 
+ 
7 
š Nun 
Average diameter 
frontal дати врес 
теп 
са. 
PE OLED 
in9 (113-0123) 3 
2.05(11.4-13.3)| 1 
11.7 (11.1-12.0)| 6 
11.3 (11.0-1.8) 3 
11.9 (11.5-12.4)| 4 
11.5 (11.2-12.0) 7 
ber о 
bs Num- 
í | Average percental ber of 
i "n of speci- 
s а to mens 
e 
80 (74.8-83.0) 10 
81 (77.0-83.6) | 6 
| 
| 
79.5 (73.7-84.9)| 14 
پک = 
81 (78.2-86.4) 3 
| 
77 (74.5-79.1) x 5 
| 
| 
79 (76.3-82.6) | 8 
x 79 (73.5-85.6) | 14 
AI 
Foramen 
magnum: 
average 
diameter 
ЛААГ‏ ت 
CIR: 
3.45 )3.3-3.7( 
3.3 (3.0-3.5) 
3.25 (3.15-3.35) 
3.33 (3.05-3.7) 
3.18 (3.0-3.5) 
3.13 (3.0-3.3) 
3.15 (2.9-3.3) 
3.14 (3.0-3.3) 
LOWER JAW—AVERAGE DIMENSIONS AND COMPARISON 
Sex and Locality 
Males 
Louisiana 
Arkansas: Boytt’s Field 
Arkansas: Menard and Greer cemeteries 
Arkansas: Drew and Mississippi counties 
Females 
Louisiana 
Arkansas: Boytt’s Field 
Arkansas: Menard and Greer cemeteries 
Num- 
ber of 
Average bigonial 
speci- diameter 
mens 
cm. 
11 70.7 (9.5-11.6) 
9 10.5 (9.9-11.2) 
1 
44............. 
13 10.0 (9.1-11.3) 
7 | 9.9 (9.5-10.7) 
4 0.05 (98-101) 
Мит- | 
ber of: |... | 
speci- | Average angle speci- 
ens | mens 
s| 
Num- 
ber of 
Average height 
at symphisis 
| degrees 
13 118(109-131) 11 
10 120(112-128) 10 
11 
1 |116. 1 
8 118 (108-126) 7 
cm. 
3.75 (3.4-4.4) 
3.65 (3.2-3.9) 
3 
3 
14 |221 (109-134) 12 
8 |22(110-128) 7 
3 |125 (121-129) 3 
Тһе angle of the lower jaw, 
fication in individual cases, 
value. 
which was measured whenever possible on both 
sides, was found—taking the Louisiana skulls of both sexes—equal on the two sides 
in two, larger on the right in six, and larger on the left in eight cases. Taking all 
the available specimens together, it was equal in five cases, larger on the right in 
twelve, and larger on the left in seventeen. These results seem to indicate that 
there is a slight tendency toward a larger angle on the left side. 
~ Тһе sexual differences are again very slight. In the averages the female lower 
Jaws of all the groups show a slightly wider angle, but, as an aid in sexual identi- 
that proportion in this particular region is of little 
