YERKES. — VARIATION IN THE FIDDLER CRAB. 



423 



IV. Results. 



1. Tables of Means, Modes, Standard Deviations, and Coefficients 



of Variability. 



Table I. contains the results of all calculations so arranged as to facili- 

 tate comparison of right and left-handed animals. The first of each pair 

 of columns gives the values for the right-handed individuals, — indicated 

 at the top by "Rights;" the second, for the left-handed, — indicated by 

 " Lefts." 



It is to be noted that no identical measurements for Rights and Lefts 

 (for sake of brevity we shall hereafter speak of the tvv^o types as Rights 

 and Lefts instead of right-handed and left-handed) are strictly comparable, 

 except frontal breadth and median length, for in every other case there 

 is marked asymmetry, and the measurements for the left side of one type 

 have to be compared with those for the right side of the other. 



TABLE II. 

 Means and Coefficients of Variability arranged for Direct 



Comparison. 



