nephridial

There are six pairs of nephridial excretory organs, which empty into the mantle cavity.

This occurs while the eggs are within the genital pouches (nephridial sacs).

In many earthworms the nephridial ducts open into the digestive tract instead, a condition known as enteronephry.

A pair of maxillary glands, also called nephridial organs, involved in osmoregulation and excreting nitrogenous waste open up to the gnathochilarium and wastes are passed entirely through the digestive tract before being evacuated.