Abstract
Several specimens of an ichthyobdellid leech were found on Blennius pholis collected on the coast of Anglesey.The leech resembles Abranchus sexoculatus (Malm), a rare form only recorded previously from Sweden and not yet adequately described. Slight differences, however, indicate that it may be a distinct species and the name Abranchus blennii is provisionally put forward for it.A short review of the genus Abranchus and a description of the appearance and structure of the leech follow.My thanks are due to Prof. F. W. Rogers Brambell for his encouragement and advice; and to Mr W. H. Leigh-Sharpe for advice regarding the literature.

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