 The paraprostatic duct enters the basal finger approximately in the middle of the muscle and opens terminally via a hollow curved stylet of about 110 μm length.The penis, the basal finger and parts of the ejaculatory and paraprostatic ducts are surrounded by a thin-walled penial sheath.The latter, together with the copulatory organs, probably can be protruded through the male gonopore just at the base of the right rhinophore during the sperm transfer.