Do flatworms have anus?

Flatworms can live freely in nature, and can also be parasites of humans and animals. In connection with these, they differ not only externally, but also internally. So, for example, the digestive system of free-living species is represented by the mouth, the muscular pharynx and the intestine, which is branched and blindly ends in the body, but there is no special anus for removing the remains. And in species of parasites, the digestive system is absent and they absorb nutrients throughout the body surface.