11. The epiphallus has 3-4 longitudinal folds proximally, transversing into anatosmosing folds more distally. 12. Reproductive system : The penis is rounded, wider than and approximately as long as the epiphallus . 13. The epiphallus is slightly curved and inside a short penis prolongation distance between penis and the pedunculus is very short. 14. The Genitalia : the penis is present only in some species, epiphallus is present in nearly all of them. 15. The sperm container is formed in the epiphallus , while the spermatophore's tail is formed by the flagellum. 16. Vas deferens of " Tamdonia serbica " is shorter, delimited from epiphallus , epiphallus shorter, penis larger. 17. Vas deferens of " Tamdonia serbica " is shorter, delimited from epiphallus, epiphallus shorter, penis larger. 18. The epiphallus lophi are saddle-like in shape with the mesal protuberance of the lophus having a smooth, rounded outline. 19. The male portion of the reproductive tract contains the vas deferens and the epiphallus . " Arion " slugs lack a penis. 20. Male copulatory organs are generally reduced, their role being taken over by a well-developed atrium and the epiphallus that produces spermatophores.
