294 



Mr Punnett, Note on the proportion 



their sex was determined with the help of a dissecting microscope. 

 The labour of collecting and measuring was materially lightened 

 by the help of a friend, to whom also I am greatly indebted for a 

 subsequent consignment of baby crabs forwarded to me shortly 

 after leaving the island. 



Table I. Shewing proportion of sexes for each increase of 

 1 millimetre in carapace breadth. 



Total no. of <Js = 1599, Total no. of $ s = 1984, Total crabs = 3583. 



