REMAINS, FROM ARKANSAS AND LOUISIANA. 227 
Os CALCIS—CONTINUED 
LOUISIANA 
| MALES FEMALES 
Proportions * кылы ы la 
um Num- | um- | 
= Right do a Left sr 9| Right "У Left 
mens mens mens | ens 
| 8.0 | 7 | | 
Length (maximum), cm. ма Y | 95 | 74 | 74 
vis. i | (745-84) | 11 | (5825 | 5 | (7.28-7.65)| 5 | (7.05-7.65) 
Breadth (minimum at ЕС 25 а | 2.8 | | 2,45 | 2.5 
middle of body), cm. | (2.5-2.9) | (2.6-3.0) | Š | (2.35-2.6) | 5 | (2.3-2.6) 
| | | 
Height (maximum a | 11 4.0 11 | 3.95 | 5 22 | | 3.5 
шай of Бойу), Ma 11 | (3.85-4.2) (3854.3) | 5 | (323.7) | 5 | (3237) 
| | | | | 
Breadth-height index Par 1,654 п! 78 5 | ДИ Т 70,8 
e X 100 | (61.9-74.0) | (67.5-73.4) | | (64.9-75.0) | ` (68.7-78.1) 
height | | | | | | 
| | | 
* Pairs only. 
In 72 specimens from both sexes in which the facets for the astragalus can be 
examined, there are two of these facets in 21 (29 per cent.) and three in 51 cases 
(71 per cent.). These proportions are almost identical in the skeletons from the 
two regions: 2 facets in 52 per cent. of the bones from Arkansas, and in 29 per 
cent. of the bones from Louisiana. 
As to sexual differences, two facets exist in 26 per cent. of the males and in 37 
per cent. of the females, showing a perceptible preponderance for the latter. 
The sustentaculum tali generally shows fair to marked projection. The 
peroneal spine is frequently well marked. In the more pronounced cases it shows 
an articular-like surface for the play of the tendon on its under side. The internal 
tubercle often shows anteriorly, at the insertion of the flexor brevis digitorum, slight 
to moderate exostoses. 
The left os calcis of male skeleton 255.106, Louisiana, presents a rough semi- 
lunar notch or defect antero-interiorly in the margin of the foremost astragalus facet 
and the adjoining border. 
Astragalus. 
The number of clearly-separated articular facets for the os calcis on the astra- 
galus does not by any means correspond with the number of those on the heel bone. 
Thus, a clear separation by an interval of an anterior and a lateral astragalus facet 
is present in only four of the 43 specimens, or approximately 10 per cent. 
Os trigonum was not found. 
