. The Canadian field-naturalist. . Figure 4. (1) Navicula radiosa; (2) Eunotia diodon; (3)Navicula laevissina; (4) Dinobryon bava- ricum; (5) Eunotia serra var. diadema; (6) labellaris flacculosa (a) girdle view,(6) valve view; (7) Ceratium hirundinella (a) cyst (b) Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club

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