MUSEUM OF COMPARATIVE ZOOLOGY. 25 



REPORT ON THE COELENTERATES. 



By Henry B. Bigelow. 



For accessions during the past year, thanks are due Prof. E. L. 

 Mark, for Medusae and siphonophores from Bermuda, and to the 

 Canadian Geological Survey, for Medusae from Hudson Bay. A 

 series of samples of the Plankton trawls made by the Albatross, in 

 1920, from the U. S. Bureau of Fisheries, should also be men- 

 tioned. 



The oceanographic and biologic exploration of the Gulf of 

 Maine, in which the Museum has cooperated with the U. S. 

 Bureau of Fisheries since 1912, is now ripe for a comprehensive 

 account of the results, and to this most of my time has been 

 devoted throughout the year. To fill in gaps in the data, the U. S. 

 Fisheries Steamer Halcyon, in my charge, cruised in the northern 

 part of the Gulf from December 29th. to January 9th., and again 

 during the first week in March, working 23 stations, at which 89 

 serial temperatures with salinity records, and 47 tow-net hawls 

 were obtained. 



It may be of interest to recapitulate that the total number of 

 Gulf stations worked since 1912, basis for the forthcoming report, 

 is about 350; of serial temperature records (usually with corre- 

 sponding determination of salinity), 1,373; of tow-net hawls with 

 the various nets, 1,016; and that longer or shorter cruises have been 

 carried out during every month of the twelve, in one or other year, 

 by the Grampus, Albatross, Halycon, or Blue Wing. 



Besides the Gulf of Maine work, I have, as in previous years, had 

 general direction of the scientific program of the International 

 ice-patrol of the Grand Banks, by the U. S. Coast Guard Steamer 

 Seneca, February-June, Lieut. -Commander E. H. Smith and 

 Mr. E. F. B. Fries respectively collecting the physical and biologic 

 data. 



As a result of negotiations between the United States and 



