on board H.M.S. 'Challenger.' 473 



Sounding 65. 31st March, 1873. 2700 fathoms. Lat. 27° 49' K, long. 

 64° 59' W. A red clay containing : — Much amorphous matter ; 

 many very fine mineral particles ; a good many remains of pelagic 

 Foraminifera and Coccoliths ; no remains of siliceous organisms 

 were observed. 



The dredge brought up much mud ; in the siftings were found : — 

 a few manganese pellets ; a few arenaceous Foraminifera, Nodo- 

 sarias, &c. ; Biloculina, Hotalia, and Carjpenteria on a concretion ; a 

 few pieces of red cherty-like mineral ; a few concretions of the 

 bottom; a small piece of pumice (?); one Echinus-spine; a small 

 shark's tooth. 

 The tests of the arenaceous Foraininifera were chiefly small, white, 



mineral particles ; and these, I think, are from broken-down pieces of 



pumice. 



Sounding 66. 1st April, 1873. 2600 fathoms. Lat. 29° 5' N., long. 

 65° 1' W. A red clay containing : — Much amorphous matter ; 

 many very fine mineral particles ; a good many pelagic Foraminifera, 

 with Coccoliths and Ehabdoliths. 



Sounding 67. 3rd April, 1873. 2475 fathoms. Lat. 31° 24' N., long. 

 65° 00' W. A red clay containing : — Much amorphous clayey matter ; 

 many fine crystalline and mineral particles ; a good many pelagic 

 Foraminifera, Coccoliths, and Ehabdoliths, and some amorphous 

 calcareous matter ; one siliceous spine, but no Eadiolaria observed. 



Sounding 68. 3rd April, 1873. 2250 fathoms. Lat. 31° 49' N., long. 

 64° 55' W. A coral-mud containing : — Many pelagic Foraminifera, 

 Coccoliths, Ehabdoliths, and broken pieces of dead coral ; amorphous 

 calcareous matter ; a few mineral particles (some green) ; a few 

 siliceous spines and Eadiolaria. 



Sounding 69. 3rd April, 1873. 1820 fathoms. Lat. 32° 1' N., long. 

 64° 50' W. A coral-mud containing : — Many pelagic Foraminifera, 

 Pteropods, and other surface shells, Coccoliths, and Ehabdoliths; 

 broken pieces of Coral, Polyzoa, and Eehini-sviiios ; amorphous cal- 

 careous matter. 



Sounding 70. 30th April, 1873. 950 fathoms. A coral-mud contain- 

 ing : — Pelagic Foraminifera, Pteropods, and surface Grasteropods ; 

 broken pieces of Coral, Polyzoa, &c. ; much amorphous calcareous 

 matter ; a few siliceous spines and Eadiolaria. 



Sounding 70 a. 4th April, 1873. 435 fathoms. Off Bermuda. A coral- 

 mud containing : — Much amorphous calcareous matter; pelagic and 

 other Foraminifera, Pteropods, &c. ; broken pieces of Coral, Polyzoa, 

 &c. ; a few siliceous spines. 



Soundings off the reef at Bermuda, about a mile from the edge of the 

 reef, in the gun-boat, gave always a coral-sand containing : — Broken 



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