34 ANNUAL REPORT OF THE 



ACALEPHS. 



By Henry B. Bigelow. 



The more important accessions received during the year have 

 been a series of medium sized specimens of Dactylometra quin- 

 quecirra from Mr. Thomas Barbour, and several living specimens 

 of Haliclystus auricula from Mr. Owen Bryant. Specimens of 

 Tima formosa and Aurclia favidula have been purchased, and the 

 latter, as well as an example of Dactylometra lactea from Cuba 

 have been prepared for exhibition in the Synoptic room. Through 

 the courtesy of Mr. R. Rathbun the entire collection of Pacific 

 Medusae and siphonophores in the U. S. National Museum has 

 been loaned for study. 



The greater part of the year has been occupied in completing 

 the report on the Medusae collected by the "Albatross" in the 

 eastern Pacific in 1904-1905. Considerable time has been given 

 to re-identifying and relabeling the 'collection. As much of the 

 material has never been identified, this work has progressed 

 slowly. The siphonophores of the 1891 "Albatross" expedition, 

 returned by Dr. Chun, have been identified. Several jars of 

 unassorted Plankton from Woods Hole, Mass., presented two years 

 ago by Dr. G. H. Parker, have been sorted, and many acceptable 

 siphonophores and Medusae obtained from them. 



During the first half of July, through the courtesy of Mr. G. M. 

 Bowers, Chief of the U. S. bureau of fisheries, I visited the Gulf 

 stream south of Martha's Vineyard in charge of the U. S. F. C. 

 schooner "Grampus." The main objects of the expedition were 

 to study the intermediate fauna, and to test the deep sea trap 

 devised by the Prince of Monaco, employed for the first time 

 on this side of the Atlantic. On our return around Cape Cod we 

 were able to compare the surface fauna of the cold current with 

 that of the warm waters of the Gulf stream, finding the usual 

 characteristic differences. Owing to favorable weather we made 

 frequent hawls with the open nets at the surface, and at various 

 depths down to 300 fathoms, and likewise employed the Tanner 

 closing net at depths down to 200 fathoms. Temperatures were 

 taken at various depths with the deep sea thermometers, and a num.- 



