Descriptions are given of the new genera
Neopygospio (type
N. laminifera, nov.) and
Novobranchus (type
N. pacificus, nov.); of the new species
Nereis (Eunereis) wailesi,
Spio butleri,
Neopygospio laminifera,
Novobranchus pacificus; and of the new variety pacificus of
Distylia volutacornis (Montagu). All are from the Pacific coast of Canada. Synonymy is proposed of
Lepidonotus caelorus Moore with
L. squamatus (Linné), and of
Goniada eximia Ehlers with
Ophioglycera gigantea Verrill. In addition to the new species and variety, records of three species new to western Canada are presented, and notes on others. Thirteen species and a variety new to eastern Canada are recorded, one of them new to North America.