REMAINS, FROM ARKANSAS AND LOUISIANA. 213 
The shape of the shaft in cross-section at middle approaches, for the greater 
part (as will be seen from the details given below), the prismatic, or a prismatic 
with a broadening of the anterior border into a fourth surface. There is also a fair 
percentage of plano-convex humeri which represent the juvenile form. 
HuMERUS—SHAPE OF SHAFT AT MIDDLE (а). 
ARKANSAS LOUISIANA 
Types of Shape y 
Males Females Males | Females 
Right| Left Right Left Right Left Right Left 
Number of specimens ex- | | 
атіпес 11 11 $ 6 21 HI 18 
Types: 
1 or near 1 (0) | 3 | 4 3 1 9 9 17 12 
2 or near 2 (с) Е-е” o 0 1 8 2 
4 or near 4 (d) | 5 &:4- 1 1 & 15.4 1 3 
| | | 
p.c. or near p. c. (e) 3 3 | Қы ке Tr 15:3 1 1 
с Lateral prismatic. 
d Anterior border at and below middle is broadened into a fourth surface. 
Plano-convex. 
The torsion was found, barring a few individual exceptions, to be moderate. 
The deltoid eminence, while generally well marked, is pronounced only in the 
humeri of one skeleton, namely, female 255.130, Arkansas. 
None of the humeri examined bears more than a trace of the supra-cond y loid 
process. 
The articular extremities show the usual sex differences. 
The septum between the coronoid and the olecranon Говва is defective in a 
large proportion of these humeri. These defects appear to be more common in the 
Arkansas series than in that from Louisiana, and, as usual, they are decidedly тоге 
frequent in the females than in the males. As to the sides, there is in these series 
a slight preponderance of the defects on the right, which is contrary to the rule, 
and is probably accidental. As in other cases the perforation is often found on 
both sides of the body. The relatively great frequency of these defects, which are 
formed principally during childhood, by physiological absorption of the bone com- 
posing the septum, will be noted from the fact that, among 2371 humeri of whites 
of both sexes, examined by the writer, such defects existed only in 99, or 4.2 per 
cent. In the following table are presented the details in regard to this peculiarity 
in the humeri under consideration. 
