510 Mr. J. Murray on Oceanic Deposits examined 



mostly of a brown colour. It was more compact than yesterday's and 

 contained more Eadiolarians and fewer pieces of the delicate large cylin- 

 drical Diatom (see notes on Diatoms, p. 533). 



Sounding 288. 28th August, 1875. 2700 fathoms. Lat. 9° 28' N., 

 long. 150° 49' W. A small quantity came up, which indicated a 

 Eadiolarian ooze of a yellow colour containing : — Great numbers of 

 Eadiolarian and remains of other siliceous organisms ; a few 

 rounded, olive-coloured, and some small white mineral particles ; 

 some manganese grains. 

 Thecolourof this sounding was thesameas thelower layerof our deepest 

 sounding, 4475 fathoms, and as the yellow patches in the last sounding. 

 Sounding 289. 30th August, 1875. 2900 fathoms. Lat. 7° 35' N., 

 long. 149° 49' E. A Eadiolarian ooze of a brown colour, with a 

 thin upper layer of a pale straw-colour, containing : — Immense 

 numbers of Eadiolarians, Diatom, Challengeria, and remains of 

 other siliceous organisms ; a few small white and yellow mineral 

 particles ; some amorphous clayey matter ; a good many manganese 

 grains. 

 There appeared to be a thin surface-layer of a yellow colour. It dif- 

 fered from the mass of the bottom beneath only in the relatively less 

 abundance of manganese grains. 



Sounding 290. 2nd September, 1875. 2550 fathoms. Lat. 5° 54 ; K, 

 long. 147° 2' ~W. A Eadiolarian ooze, upper layer yellow, lower 

 layer brown-coloured, containing : — Immense numbers of Eadio- 

 larian, Diatom, and Challengeria remains ; a few pelagic Forarni- 

 nifera and their broken parts (Pulvinulinas, Orbulinas, Grlobigerinas) 

 and some Coccoliths ; some amorphous clayey matter. 

 The Forarninifera appeared to be confined to the top layer chiefly. 

 There were fewer manganese grains in this sounding than in the last, 

 and in this sounding they were more abundant in the lower than upper 

 layer. 



Sounding 291. 4th September, 1875. 2925 fathoms. Lat. 2° 34' N., 

 long. 149° 9' W. A Globiger ma-ooze, upper layers brown, lower 

 layers cream-white colour, containing : — "Very many pelagic Fora- 

 rninifera and their broken-down parts, and Coccoliths ; many Eadio- 

 laria ; remains of other siliceous organisms ; a good deal of amor- 

 phous calcareous and some clayey matter ; very few mineral particles 

 of any kind other than manganese grains. 

 The carbonate-of-lime organisms were most abundant in the lower 

 layers. The upper brown layer had carbonate-of-lime and siliceous 

 organisms in nearly equal proportions, and this layer had more clayey 

 matter and manganese grains than the one underneath. 

 Sounding 292. 6th September, 1875. 2425 fathoms. Lat. 0° 33' S., 

 long. 151° 34' W. A white GloUgerina-oozQ containing : — Great 



