36 ANNUAL REPORT OF THE 



REPORT ON THE COELENTERATES. 



By Henry B. Bigelow. 



The most important accession received during the past year is 

 the duplicate series of Hydromedusae, Scyphomedusae, and sipho- 

 nophores collected by the U. S. F. C. S. " Albatross" in Bering 

 Sea and the northwestern Pacific in 1906 and presented by the 

 United States Bureau of Fisheries. This collection contains 

 seventy-one species, and covers a region previously unrepresented 

 in the Museum collections. The duplicate series of ctenophores 

 collected by the "Albatross" in the Eastern Tropical Pacific, 

 1904-1905, was likewise presented by the Bureau of Fisheries. 

 Other accessions are series of ctenophores from the Santa Barbara 

 Channel, gift of Mr. G. R. Agassiz, and of the Scyphomedusa 

 Charybdea, collected in Jamaica by Dr. H. L. Clark. 



During the year the ctenophores have been catalogued, this 

 task finishing the rearrangement and reidentification of the pelagic 

 coelenterates; the card catalogue lists 277 species, about 9,000 

 specimens. 



A large collection of Scyphomedusae has been loaned for study 

 by the United States National Museum. 



During the year I have been occupied with the reports on the 

 "Albatross" Eastern Pacific ctenophores, and "Albatross" North- 

 western Pacific Medusae and siphonophores. 



Apparatus for testing the salinity of sea water has been installed, 

 and the samples of sea water collected last summer off the coast of 

 New England titrated by Mohr's method. 



From July 8th until August 31st, I was in charge of the U. S. 

 Fisheries Schooner "Grampus" on an oceanographic cruise in the 

 Gulf of Maine, accompanied by Messrs. W. W. Welsh and H. E. 

 Metcalf as assistants. The object of the cruise was to make 

 a survey of the temperatures, salinities, currents, and plankton of 

 the waters north of a line from Cape Cod to Cape Sable. The 

 equipment included six Negretti and Zambra reversing deep-sea 

 thermometers, a Sigsbee and a stop-cock water-bottle, an Ekman 

 current-meter, the closing-net described in last year's report, and 

 an ample supply of qualitative and "Hensen" quantitative nets, 



