MARINE MACROPLANKTON FROM THE CANADIAN EASTERN ARCTIC: II. MEDUSAE, SIPHONOPHORA, CTENOPHORA, PTEROPODA, AND CHAETOGNATHA

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Abstract
Thirteen species of medusae, one siphonophoran, two ctenophores, two pteropod molluscs, and two chaetognaths are recorded from coastal waters of the Canadian eastern Arctic, many of them for the first time. All except one are known to be arctic or arctic–boreal species.Hybocodon prolifer L. Agassiz has not hitherto been recorded from Arctic water. Specimens answering to this species were found by the author in large numbers at Lake Harbour, on Hudson Strait. The determination of the medusa is possibly not satisfactory, and cannot be considered certain until the hydroid is found. No species of Hybocodon has been recorded from Greenland water, however, and hence this discovery may be useful to distinguish Canadian polar water from water of the Greenland current.