. Contributions to Canadian biology. Marine biology; Natural history. No. 50. Obelia No. 51. Obelia longissima. Family CAMPANULINID^. Tropliosoyne. Colonies branched or unbranched; hydrothecae pedicellate or ses- sile, always operculate, the operculum formed of converging segments; hydranths with conical proboscis. Gonosome. Gonophores producing fixed sporosacs or free medusse. KEY TO GENERA. a Hydrotheca pedicellate. h Hydrotheca] margin distinct. c Operculum of several converging segments. Calycella. cc Operculum of four segments. Tetrapoma. ccc Operculiim shaped like an A-tent. St
. Contributions to Canadian biology. Marine biology; Natural history. No. 50. Obelia No. 51. Obelia longissima. Family CAMPANULINID^. Tropliosoyne. Colonies branched or unbranched; hydrothecae pedicellate or ses- sile, always operculate, the operculum formed of converging segments; hydranths with conical proboscis. Gonosome. Gonophores producing fixed sporosacs or free medusse. KEY TO GENERA. a Hydrotheca pedicellate. h Hydrotheca] margin distinct. c Operculum of several converging segments. Calycella. cc Operculum of four segments. Tetrapoma. ccc Operculiim shaped like an A-tent. Stegopoma. hh Hydrothecal margin not distinct. Reproduction by fixed sporosacs. Opercularella. aa Hydrotheca sessile. Hydrotheca tubular, margin indistinct. Cuspidella. Trophosome. A creeping stolon gives rise to tubular hydrothecae on annulated pedicels; margin distinct; several segments to the operculum. Gonosome. Gonangia borne on the stolon; acrocysts 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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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
