Additions to the descriptions, based on study of type material, are made for Laphania boecki (new record, Northeast Pacific), Neoamphitrite robusta (syn., Scionides dux), Neoleprea californica and N. spiralis, Pista brevibrunchiata (new record, British Columbia [B.C.], Washington [WA], Japan) and P. fratrella, and Polycirrus californicus (new record, B.C., WA, syn., P. perplexus).
Après étude du matériel type, nous ajoutons aux descriptions de Laphania boecki (mention nouvelle, Pacifique Nord-Est), Neoamphitrite robusta (syn., Scionides dux), Neoleprea californica et N. spiralis, Pista brevi branchiata (mention nouvelle, Colombie-Britannique [C.-B.], Washington [WA], Japon) et P. fratrella, et Polycirrus californicus (mention nouvelle, C.-B., WA; syn., P. perplexus).