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Special sacs developed from the intersegmental septa lodge the developing ova and sperm.
At the end of the airways are clusters of tiny air sacs.
Sperm ducts and atria as in Limicolae; egg sacs large; body wall thick; vascular system and nephridia as in Terricolae.
The walls of the renal sacs are deeply plaited and thrown into ridges.
It is indeed only among the Eudrilidae that the enclosure of the ovaries in septal sacs is at all general.
