About species of <i>Polydora</i> (Polychaeta: Spionidae) from the Balaklava bay (the Black Sea)
<i>Polydora cornuta</i> Bosc, 1802, a new for the fauna of Ukraine, has been found in planktonic and benthic collections from the Balaklava bay. This species is common in this region. In all probability this species penetrated into the Black Sea far before, but his identification was hampered its morphological similarity to the native species of <i>Polydora ciliata</i> (Johnston, 1838).