No. 12. Cruise of the U. S. Fisheries Schooner ^^ Grampus ^^ in the 

 Gulf Stream during July, 1908, with description of a new 

 3Iedusa {Bythotiaridae). By Henry B. Bigelow. 



From July 7 to July 18, 1908, the schooner "Grampus" was detailed 

 by the Hon. G. M. Bowers, U. S. Commissioner of Fisheries, for work in 

 the Gulf Stream, under the direction of the Museum of Comparative 

 Zoology. 



The main purpose of the cruise was to investigate the fauna of the 

 intermediate waters of the Stream, a branch of study which has become 

 of great interest since the demonstration, by the recent deep-sea expedi- 

 tions of the " Valdivia," the " Princess Alice," and the " Albatross," of 

 the existence of an important intermediate pelagic fauna, distinct on the 

 one hand from the surface fauna and on the other from the bottom 

 fauna. This intermediate fauna was collected in great abundance by the 

 expedition of the "Albatross" to the Eastern Pacific in 1904-1905 in 

 the course of the Humboldt current, and in all probability it is abun- 

 dant in the Gulf Stream also ; especially since certain of its characteristic 

 components, e. g., the Scyphomedusae Atolla and Periphylla, have been 

 taken repeatedly in this region in the trawl. Up to the present time, 

 though much surface collecting has been done in the Gulf Stream and 

 the bottom thoroughly explored with the trawl, its intermediate depths 

 have been almost entirely neglected. 



A second purpose was a trial of the deep-sea trap devised by the 

 Prince of Monaco. This apparatus has been employed with great suc- 

 cess off the European coast, but had not been tried previously on this 

 side of the Atlantic. In addition to these two main objects surface col- 

 lections were made on favorable occasions and intermediate as well as 

 surface temperatures taken. 



The "Grampus" has no reeling engine, and to supply this deficiency 

 she was equipped for the occasion with a gasoline hoisting motor, con- 

 structed by the Olds Engine Co. This apparatus, of three horse power and 

 geared to hoist by means of a gipsy head at the rate of about 100 feet 

 per minute, proved entirely satisfactory. From the gipsy head the wire 

 rope was led to a hand reeling winch. The collecting apparatus 

 consisted of several five-foot open nets, of the "Albatross" pattern, a 



