Аннотация:More than 110 species of diatoms were identified from samples collected from Manitounuk Sound, Hudson Bay, in 1978. We presently deal with six genera, belonging to the family Naviculaceae; Diploneis (3 taxa), Gyrosigma (3 taxa), Pinnularia (18 taxa), Pleurosigma (4 taxa), Stauroneis (1 taxon), and Stenoneis (1 taxon).All the species were reevaluated and complete illustrated descriptions, biometric data, and worldwide distributions are given. Two new species and two varieties are described and a new combination is proposed.
