YERKES. — VARIATION IN THE FIDDLER CRAB. 



435 



Polygon No. 9R. 



Polygon No. 9L. 



9. Carpopodite of small chela. Polygons No. 9R and 9L. The car- 

 popodite is the most variable organ measured, the largest coefficient of 

 variability being that of the carpopodite of the small chela of the Lefts, 

 and the second largest, that of the carpopodite of the great chela of the 

 Lefts. 



