The only comparable fact among other worms is the Laurer's canal or genitointestinal canal in the Trematoda.
This last tube is probably the homologue of Laurer's canal (Goto, 8).
Tnis duct (Laurer's canal) is sometimes rudimentary and ends blindly beneath the skin.
A canal (Laurer's canal) leads from the oviduct or yolk-duct to the dorsal surface.
It has been compared with the canal of Laurer of Trematodes (the vitello-intestinal duct of the ectoparasitic flukes), but if we take the more primitive Cestodes, and especially Aniphilina, into consideration we find that they possess, in addition to the uterus, an anterior vagina (usually present in Cestodes) and a posterior one.