Genital duct diaulic; male and female apertures contiguous.
Genital duct triaulic. Spicules present in the mantle.
Genital duct always triaulic, and male and female apertures distant from each other.
From the ovo-testis, which lies near the apex of the visceral coil, a common hermaphrodite duct ve proceeds, which receives the duct of the compact white albuminiparous gland, Ed, and then becomes much enlarged, the additional width being due to the development of glandular folds, which are regarded as forming a uterus u.