47G 



J'DT'I 



females, mnles and lieniiaplirodites, in cultures proLaLly 

 derived from nearly related individuals. 



Siniilarl\', the various species may be arranged in gradation, 

 to show the su]ipressioii of the male sex. In Diplogaster 

 maupasi the males occur occasionally in such proportions as 



Text-fig. 11. 



to recall their original numerical equality Avith the female sex. 

 But this species, in the majoiity of cultures and most cithers, 

 at all times produces males in exceedingly small numbers. 

 Finally, in Ehabditis gurneyi the male has possibly 

 entirely disappeared, though of this it is difficult to adduce 

 positive pioof. 



