Fourteen species representing four genera
Boccardiella,
Neoboccardia,
Polydora and
Pseudopolydora of the polychaete family Spionidae from the North West Pacific are described on the basis of author's collections as well as material deposited in five museums. The study includes eight previously described species, two species raised in rank from subspecies, four new species, and six synonyms. Descriptions, figures and ecological data of the species covered, keys to the species of
Polydora and
Pseudopolydora from the North West Pacific, and diagnoses of the genera covered are included.
