 The opening of the stylophore leads directly into the atrium in certain species in the families Vitrinidae , Parmacellidae , Helminthoglyptidae , Bradybaenidae , Urocyclidae , Ariophantidae , and Dyakiidae . The opening of the stylophore can instead lead to the penis , as is the case in some species of <unk> ( a subfamily of <unk> ) , <unk> , <unk> , Gastrodontidae and <unk> . Alternatively , it can lead to the vagina , as in the case in some species of <unk> ( a subfamily of <unk> ) , <unk> ( a subfamily of <unk> ) , Philomycidae , other species within the Bradybaenidae , and also in the Hygromiidae , Helicidae and Dyakiidae . 
