THOMPSON: SNAIL GENUS MARSTONIA


posterior pallial
- oviduct


anterior pallial
 oviduct -



 oviduct I-













 oviduct II-


-bursa copulatrix

seminal receptacle


oviduct I


B

1mm


FIGURE 18.-Marstonia halcyon new species: (A) female reproductive system intact except for
the ovary; gpd = gonopericardial duct, sr= seminal receptacle; (B) oviduct and associated struc-
tures freed from the pallial oviduct.