Figure 4.3 



Development of Imposex (Male Organs) on Female Dogwhelks 



stage 1 



Abbreviations : 



a: anus 



Nucells lapillus . 'six stages in the development ' of imposex from its 

 initiation (stage 1) to sterilization (stage 5) and subsequent accumula- 

 tion of aborted capsules in capsule gland (stage 6) . A longitudinal cut 

 of the mantle cavity roof is made to expose the genital system: see text 

 for explanation. 



Source: Gibbs et al., 1987. 



IV--26 



