12 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
order of magnitude as for the Australasian and is considerably smaller 
than the Californian. 
L carapace/L rostrum: Again the mean Chilean value is closer to 
the Australasian than to the Californian. It is just significantly 
different from the former (p ca. 0.1) but 1s highly significantly different 
from the latter (p <0.001). Variability is approximately the same 
throughout. 
EYES AND EYESTALKS.—L/B cornea: The mean Chilean value is 
midway between Australasian and Californian values, with differences 
significant in both cases (p ca. 0.001 and <0.05, respectively). Varia- 
TABLE 2.—Comparative data of Australasian, Chilean, and Californian specimens 
No. of segments of Intermediate telson L/B rostrum 
mandibular palp 
Aust. Chile Calif. | Aust. Chile Calif. | Aust. Chile Calif. 
Mean 2.3558 2.5500 2.7083 | 1.3559 1.0 1.0274 | 1.1021 1.1744 1.3357 
n 104 18 72 118 18 73 59 9 35 
Range 1-3 2-3 1-3 0-3 1 1-2 0.88- 1.10- 1.10- 
1. 26 1. 29 1.54 
Standard deviation 0.473 0.497 0.484 0. 612 0 0.163 | 0.0821 0. 0678 0.112 
Standard deviation 0.201 0.194 0.179 | 0.451 0 0.159 | 0.0745 0.0577 0.0839 
mean 
L carapace L/B cornea Leye 
L rostrum B cornea 
Aust. Chile Calif. | Aust. Chile Calif. | Aust. Chile Calif. 
Mean 4.7746 4.5388 4.0543 | 1.2013 1.2689 1.3203 | 1.3220 1.5056 1.4576 
n 59 9 35 55 9 32 54 9 33 
Range 4. 0- 4.1- 3.50- 1.08- 1.18- 0.95- 1.08- 1.41- 1.12- 
6.0 5.15 4. 57 1.36 1.38 1.55 1. 46 1. 65 1.92 
Standard deviation 0.442 0.3376 0.3046} 0.0589 0.0617 0.0931 | 0.0733 0.0782 0.3123 
Standard deviation 
mean 
0.0926 0.0744 0.0750 | 0.0490 0.0486 0.0705 | 0.0554 0.0519 0.2140 
bilities of Australasian and Chilean material are roughly the same 
and lower than Californian. 
L eye/B cornea: The Chilean mean is further from the Austra- 
lasian than is the Californian; p values emphasize the difference 
between Chilean and Australasian material (p <0.001) and the simi- 
larity between Chilean and Californian (p 0.6 — 0.5). The varia- 
bility of the Californian population is much greater than that of either 
of the others. 
Summarizing these results, of the six determinations upon the 
four selected structural features, in four the mean Chilean values lie 
between the extremes of the Australasian and the Californian, and 
in the other two they lie further from the Australasian than do the 
