Eight species of marine Tubificidae, including two new species and four first records from Japan, are reported from Hokkaido. Nootkadrilus crassisetosus sp. n. is distinguished from N. verutus Baker, 1982 in having penial setae of equal length. Limnodriloides ezoensis sp. n. differs from L. victoriensis Brinkhurst and Baker, 1979 by having an oesophagus without diverticulae. Three species, Rhizodrilus pacificus (Brinkhurst and Baker, l979), Aktedrilus knoellneri Erseus, 1987 and Tubificoides pseudogaster (Dahl, 1960), are redescribed.
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