In the female there is in every fertile segment a pair of spermathecae opening at the nephridiopores.
The large sacs which have been termed vagina are suggestive of the large coelomic spermathecae in Eudrilids, a comparison which needs, however, embryological data, not at present forthcoming, for its justification.
No specialized system of spermathecae, sperm reservoirs, and copulatory apparatus, as in Oligochaeta; development generally through a larval form; reproduction by budding also occurs.
Spermathecae nearly always present.
These sacs are dealt with later under the description of the spermathecae, which function they appear to perform.