. Contributions to Canadian biology. Marine biology; Natural history. KEY TO GENERA. a Hydrotheca? all on one side of the branches, their distal ends alternating right and left. Hydrallmania. aa Hydrothecae arranged in two longitudinal rows. h Hydrothecffi in opposite pairs. Sertularia. hh Hydrothecse alternate. c Operculum of one adcauline flap. d Hydrothecal aperture small, body flask-shaped. Ahl'iinarw. dd Hydrothecal aperture large, body not flask-shaped. Diphasia. cc Operculum abcauline or with more than one flap. e Operculum of three or four pieces. Sertularella. ee Operculum of one or t
. Contributions to Canadian biology. Marine biology; Natural history. KEY TO GENERA. a Hydrotheca? all on one side of the branches, their distal ends alternating right and left. Hydrallmania. aa Hydrothecae arranged in two longitudinal rows. h Hydrothecffi in opposite pairs. Sertularia. hh Hydrothecse alternate. c Operculum of one adcauline flap. d Hydrothecal aperture small, body flask-shaped. Ahl'iinarw. dd Hydrothecal aperture large, body not flask-shaped. Diphasia. cc Operculum abcauline or with more than one flap. e Operculum of three or four pieces. Sertularella. ee Operculum of one or two pieces. Thuiaria. aaa Hvdrothecse arranged on all sides of the branches. 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 Biological Board of Canada; Canada. Marine Biological Station. Toronto, Biological Board of Canada
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