Bdellamaris eptatreti n.g., n.sp. is a piscicolid leech lacking posteriorly directed gastric caeca, having a fully formed abdominal somite divided into twelve annuli, cleven pairs of abdominal pulsatile vesicles, and a smooth flattened body without lateral flanges; six pairs of testes; the male aperture in XII. B. eptatreti is known from Eptatretus cirrhatus (Cyclostomata). Branchellion parkeri is recorded from Callorhynchus milii (Holocephali) and a patterned dark phase is described, as also an ornamented male organ. A brief superficial description is given of a leech having affinities with the g. Pontobdella, but lacking tubercles from the venter.