SB 3.6.20
gudam pumso vinirbhinnam
mitro lokesa avisat
payunamsena yenasau
visargam pratipadyate
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The evacuating channel separately became manifest, and the director named Mitra entered into it with partial organs of evacuation. Thus the living entities are able to pass stool and urine.