738 The American Naturalist. [August, 
TABLE II. 
Length. Males. Females. Breadth. Males. Females. 
34 mm 3 25 mm 4 
35 3 26 3 
36 27 1 
37 3 28 2 1 
29 2 
39 30 3 
40 5 31 2 
41 2 82 
42 1 33 1 
43 1 34 
44 1 35 1 
45 1 
Total, 11 9 Total, 11 9 
Mean, 41.4 35.3 Mean, 80.3 25.7 
Or, to put the result in still another form, we may say the glenoid 
cavity in the male measures 41 x 30 mm.,in the female 35 x 25 mm. 
According to Professor Dwight the average length in the European 
male is 39.2 mm., in the female 33.6 mm. 
II. BORDERS AND ANGLEs. 
a. Superior Border —The superior border necessarily includes a por- 
tion of the vertebral border, or at any rate so much of it as is included 
in the superior angle. As there is no peculiar variation, so far as I 
can see, which is characteristic of either sex, or is confined to either the 
Kwakiutl or Songish, I have put into a single group some of the 
extreme forms. Naturally the chief interest in the superior border 
centers in the definiteness of the supra-scapular notch. As may be 
seen in Figure 1 there is an insensible gradation in the series, passing 
a gradual parabolic curve with no indication of a notch to a well 
defined notch. Another point to be noted is the very open superior 
angle which prevails with very few exceptions, and forms a marked 
contrast to the characteristic pointed termination of the European 
shoulder-blade. 
b. Vertebral Border—Again, as for the superior border, I have - 
treated the collection as a whole, and reproduce here in Fig. 2 some 
varieties, drawing upon the entire series: é 
