. Contributions to Canadian biology. Marine biology; Natural history. No. 55. Opercularella lacerata. Opercularella pumila Clark. Trophosome. Stem erect or creeping, sparingly branched, annulated throughout; hydrotheca3 similar in shape to those of 0. lacerata but smaller. Gonosome. Gonangia fusiform on short annalated pedicels on the stem or stolon.. No. 56. Oiicrculurclla piimila. Genus Stegopoma. Trophosome. Hydrotheca with an operculum formed of two membranes folded lengthwise and which come together roof-like, with their long edges: each of these is separated from the remainder of the h

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. Contributions to Canadian biology. Marine biology; Natural history. No. 55. Opercularella lacerata. Opercularella pumila Clark. Trophosome. Stem erect or creeping, sparingly branched, annulated throughout; hydrotheca3 similar in shape to those of 0. lacerata but smaller. Gonosome. Gonangia fusiform on short annalated pedicels on the stem or stolon.. No. 56. Oiicrculurclla piimila. Genus Stegopoma. Trophosome. Hydrotheca with an operculum formed of two membranes folded lengthwise and which come together roof-like, with their long edges: each of these is separated from the remainder of the hydrotheca by a curved line; at each side the hydrothecal wall forms a triangular gable-like structure, between the two opercular membranes. Gonosome. Gonophores producing fixed sporosacs. Stegopoma plicatile (Sars). Trophosome. Stem large; stem and main branches fascicled; hydrotheca long, tubular or nearly so, sessile or with a short pedicel. Gonosome. Gonangium long, oval or cylindrical, adhering to the branch for a portion of the length.. 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 work.. Biological Board of Canada; Canada. Marine Biological Station. Toronto, Biological Board of Canada