742 The American Naturalist. [August, 
` 
TABLE III. 
Length. » Breadth. Infraspinous Length. 
| Right. | Left. | Right. | Left. | Right. | Left. 
| 165 mm. | 165 mm. |104 mm.}104 128 mm. | 124mm. 
wet 160 161 110 110 121 121 
| 160 -c 100 94 126 — 
| Males. | 160 160 109 107 122 125 
177 177 Bune. A ie sin ae ee cae 
159 164 102 104 127 125 
169 169 107 104 133 133 
Kwakiutl — MPI 
154 154 99 100 122 122 
140 130 93 94 111 : aa 
134 138 84 87 109 
Females.) 340. Lud Ome | for flees 
ae nie PENA 92 SRR 
canter Rees Joe 87 ONS 113 
180 172 107 108 140 135 
Mala 153 149 98 97 114 115 
ET? 177 110 110 135 133 
107 105 122 122 
Songish pao E. 
188 133 95 95 107 101 
Females.| 144 — T E AS 111 — 
133 151 95 95 111 115 
a. Individual Variation.—Taking the entire series as a whole, the 
range of variation in length is from 130 mm. to 180 mm.; in breadt 
from 84 mm. to 110 mm.; the infraspinous length from 101 mm. to 
140 mm. The greatest contrast is thus, naturally, found in the length, 
the longest bone exceeding by almost one-third in length the shortest. 
b. Lateral Variation.—In five instances the right bone is longer than 
the left, the total aggregate additional length being 31 mm.; in fonr 
instances the left bone is the longer, the total aggregate additional 
length being 18 mm. Lateral variation in breadth occurs equally five 
times for each side, but the total aggregate additional breadth for the 
right bone is 14 mm., while for the left it is only 8 mm, For the infra- 
spinous length the right bone is the longer six times, with a total of 20 
mm., while the left is the longer in three instances with a total of 8 mm. : 
Thus, it may may be seen that the number of instances where somè 
dimension of the right bone exceeds that of the left is sixteen, while m ue 
