No. 2.— Reports on the Results of Dredging, wnder the Swpervision 
of ALEXANDER AGASSIZ, in the Gulf of Mexico (1877-78), in the 
Caribbean (1878-79), and along the Atlantic Coast of the United 
States, during the Summer of 1880, by the U. S. Coast Survey 
Steamer “ Blake,” LIEUTENANT-COMMANDER C. D. SIGSBEE, U.S.N., 
and COMMANDER J. R. Bartuert, U. 8. N., Commanding. ° 
(Published by permission of CARLILE P. PAtreRsSON and J. E. Hitcarp, Super- 
intendents of the U. S. Coast and Geodetic Survey.) 
XXVII. 
Report on the Specimens of Bottom Deposits. By JoHN Murray. 
BLAKE DEPOSITS.! 
1. Specimens of deposits procured in the Gulf of Maine and along the 
Coast of North America between the Gulf of Maine and Cape Hatteras 
im 1880 (Stations 301-312, and 330-347) and in the Gulf of Maine in 
1875. 
These deposits consist of blue or gray colored muds and sands, the 
latter being found only in depths less than 100 fathoms. They lie be- 
tween the coast and the inner edge of the Gulf Stream. The greatest 
depths are 1394 and 1186 fathoms, situated between 30 and 40 miles 
outside the 100-fathom line. These deposits are chiefly made up of the 
debris of the land of the North American continent, the mineral par- 
ticles and clayey matter making up usually from 80 to 85 per cent of 
the whole deposit. 
1 Mr. Jonn Murray, to whom the specimens of bottom deposits collected by the 
‘* Blake” were sent for examination, has looked over the whole and selected some 
typical specimens. These have been described in detail, and he has added some gen- 
eral notes on the specimens characteristic, 1. of the Coast between the Gulf of Maine 
and Cape Hatteras ; 2. of the coast between Cape Hatteras and Lat. 31° 48’ N.: 3. 
of the coasts around the greater and lesser Antilles ; and, finally, of the Gulf of 
Mexico and Straits of Florida. 
, ALEXANDER AGASSIZ. 
MuseruM oF ComPARATIVE ZoOLocy, 
CAMBRIDGE, July 10, 1885. 
VOL. XII.— No. 2, 
