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H. H. WILDER. 



cases. It occurs about once in every hundred individuals among 

 our people, and is usually in the form of a large loop, covering 

 almost the entire heel, opening to the tibial side (Fig. 26). A 

 triradius is usual, though not necessary, lying near the curve of 

 the loop. I have met with this pattern a few times, notably in 

 each of a pair of duplicate twins, as was to be expected. Natu- 



FiG. 25. Foot of No. 87, showing the thenar pattern in the form of a closed 

 loop. One triradius is plainly visible, the upper one belongs on the curve of the 

 loop, and its position is sketched in (dotted line). The third, which is necessary to 

 transform the figure into a whorl, is indicated by the convergence of the lines of the 

 loop. That this figure is not a misplaced calcar pattern is shown by the fact that 

 in this same foot there is a normal calcar pattern, of which the end is shown by the 

 convergence from the other side of the ridges that come around the heel. The 

 friction-ridge configuration is taken directly from a print, but the foot outlines are 

 conventional, and serve to show the position of the pattern. 



rally it would be most unexpected to find this pattern in the form 

 of a complete loop, but one such case has been found, in the foot 

 of a university professor (Fig. 27). 



The morphology of the calcar pattern is still uncertain. It 

 occurs on the calcar projection of the heel, which is distinctly 

 human, and is unrepresented in the foot of any of our other 

 Primates, even the anthropoid apes. One theory identifies it 



