of the sexes in Carcinus maenas. 

 Table II. 



295 



<?sper 100 $s = 80-6. 



Some 3583 crabs in all were examined and the results obtained 

 are given in Table I. These data have been condensed in Table II, 

 from which the curve below has been constructed. On this 



Carapace breadth in mm. 



Fig. 1. Curve shewing relative proportion of the sexes at different stages of 

 growth. The broken hue denotes ? s, the continuous line 3 s. 



