生殖器
Reproductive system: The dart-sac is long and cylindrical. There is a large swelling of the free oviduct (ovitheca) just beyond the point where the vas deferens is given off. The spermatheca is rather irregularly ovate, and increases in size when containing numerous spermatophores. The penis is provided with a small kalc-sac and gives off a short caecum. The retractor muscle is attached to