64 species of Crustacea Decapoda from Brittany and adjacent areas are recorded herein. It is suggested that Hippolyte leptocerus (Heller, 1863) may well be a valid species distinct from Hippolyte longirostris (Czerniavsky, 1868). Liocarcinus vernalis (Risso, 1816) is quite definitely recorded in North Eastern Brittany. Also in the same area, two problematic specimens of Pisa were found: they could most likely be atypical P. armata (Latreille, 1803). It is demonstrated that Pinnotheres petunculi Hesse, 1872 is indeed a good species and it is also briefly characterised.
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