198 REPORT ON AN ADDITIONAL COLLECTION OF SKELETAL 
can be no doubt in more than perhaps one instance) there are a number that show 
laek of development in these features, while on the other hand there are several 
female crania in which the ridges reach moderate dimensions, and two in which 
they approach closely in extent to what would be regarded as masculine. The 
rather limited development of the ridges in some of the males agrees with what has 
been observed in the 1908 series of skulls from Arkansas. 
Mastords. 
As in the case of the Menard and Greer skulls, the mastoid processes in both 
the Arkansas and the Louisiana series often show only a moderate development in 
the males, while in the females they frequently exceed the average determined in 
the same sex in whites and in Indians from other regions. In detail the conditions, 
compared with white male and female standards respectively, are as follows :! 
ARKANSAS LOUISIANA 
| Males | Females Males Females 
mall | 1 | 0 5 0 
осе to 1l | 2 6 11 
medium | 
Above medium | 1 8 6 7 
The rather strong development of these processes іп the Arkansas апа Louis- 
iana females no doubt bears relation to a good development in this sex of the sterno- 
cleido-mastoid muscles, the growth of which was probably favored by the habitual 
carrying by these women of heavy jars and other burdens on their heads. 
Sutures. 
Serration.—The serration of the cranial sutures in Indians is generally less 
complicated than in the whites, and the Arkansas and Louisiana skulls here dealt 
with form no exception. The conditions are actually as follows 2 
Н 
| 
ARKANSAS | LOUISIANA 
| Males Females | | Males Females 
Near medium 8 | 0 | 5 0 
in whites || 
Sub-medium 6 Ў | 10 11 
(2-3 Вгоса) | 
More or less 4 3 | 1 6 
simple (1-2 | 
It is interesting to observe that the only skulls in which the serration ap- 
proaches the approximate average in whites are those of males, and that, on the 
‘In 23 male and 12 females Arkansas skulls of the earlier National Museum collections, the 
mastoids are (male compared to male and female to female standards); Small, M. 6, F. 0; medium, 
T. 16, ve medium, A 
2 In 22 male and 13 female Arkansas skulls from the earlier collections in the National Museum, 
the condition of елена of sutures is: Near medium, M. 1, Е. 0; sub-medium, M. 14, F. 8; more 
or less simple, M. 7, 
