Seven species of Lumbriculidae, a family of fresh water Oligochaeta, found in Britain are described and a key is erected for their identification. Two species of Trichodrilus, separated by Beddard are redescribed, resulting in a new synonymy. Trichodrilus Hrabêi sp. n. from Denbighshire is denned. Dorydrilus michaeheni is recorded for the first time from Great Britain.