[85] 



LISTS OF DREDGING STATIONS. 



957 



LIST OF DREDGING STATIONS OCCUPIED BY THE U. S. 

 COAST SURVEY STEAMERS CORWIN, BIBB, HASSLER, 

 AND BLAKE, FROM 18G7 TO 1880. 



The dredgings from 18G7 to 1S71, and those of the Sassier in 1872, 

 were all made by Count L. F. Pourtales, Assistant U. S. Coast Survey, 

 in a great measure under the direction of Prof. Louis Agassiz, who ac- 

 companied several of the expeditions. Their positions were originally 

 published in the Bulletin of the Museum of Comparative Zoology at 

 Cambridge, Mass., in September, 1879. A continuous series of numbers 

 running from 1 P. to 221 P. has been assigned to them for convenience 

 in placing them on charts without confusing them with other Coast Sur- 

 vey or Fish Commission dredgings. 



The following stations were occupied by the Corwin, Acting Master 

 R. Piatt, U. S. Navy, commanding, in 1867, in connection with a survey 

 for a telegraph cable between Key West and Havana. The expedition 

 was cut short by the breaking out of yellow fever on board. 



The dredging in 1868 and 1869 were made by tbe Bibb, Acting Master 

 R. Piatt, U. S. Navy, commanding. They are all situated in the Florida 

 straits, between Tortugas and Cape Florida. The positions, as pub- 

 lished in the Bulletin of the Museum of Comparative Zoology, were only 

 given in a general way, and are here taken from Count Pourtales's orig- 

 inal charts, preserved iu the Coast Survey Office. A separate series of 

 numbers is attached to each day's work, both on the charts and in the 

 bulletin, and these numbers and the depths given correspond for the 

 most part, except that the depth on the charts have been corrected whilst 

 those in the bulletin, are apparently from the original rough notes. In 

 some cases, however, a different number is given to the haul on the 

 chart from that in the bulletin. All notes here given on the character 

 of the bottom are also derived from the charts. The number and letter 

 assigned to each dredging on the original charts and record-books, the 

 number given in the bulletin, and the depths given by them, respect- 

 ively, are given in separate columns, so as to facilitate future compari- 

 sons. A few hauls, mostly shallow water ones, it has been impossible 

 to place exactly. 



