None. Begins: In this work, I do not pretend to give a complete list of Nereis species living in the Roscoff region, given the short time, about a month, that I was able to pass through this station. Nor could I, in such a short period of time, plan to carry out a systematic review with the necessarily quite limited materials that I collected, nor find species or varieties new to the region, given, on the other hand, that the fauna of the Nereis has already been studied in great depth in the English Channel. I will cite in particular the works of de Saint-Joseph (1888, 1895, 1898, 1906) relating to the Dinard region and various points of the Breton coast, some of which are very close to Roscoff, Pempoull and Brignogan, for example.
