504 Mr, J. Murray on Oceanic Deposits examined 



some amorphous clayey aud calcareous matter, aud a few mineral 

 particles. 

 In the trawl were one or two small pieces of pumice. 



Sounding 246. 23rd March, 1875. 4575 fathoms. Lat. 11° 24' N., 

 long. 143° 16' E. A trace came up on the outside of the tube which 

 indicated a Eadiolarian ooze the same as described below, No. 247. 



Sounding 247. 23rd March, 1875. 4475 fathoms. Lat. 11° 24' ST., 

 long. 143° 16' E. A Eadiolarian ooze (upper layers red, lower 

 layers pale straw-colour), containing chiefly the remains of Eadio- 

 laria, Diatoms, Challengerias, and other deep-sea Ehizopods (see 

 notes on Surface Animals, p. 535) ; one or two white mineral 

 particles (pumice ?).; one or two pieces of a yellow and green mineral 

 (flinty concretion ?) ; a very small quantity of amorphous clayey 

 matter ; many small peroxide of manganese particles. 

 A section of about 3 inches came up in the tube ; the upper 2 inches 

 were of a red colour, and contained very many of the small manganese 

 particles. These manganese grains apparently gave the colour to these 

 layers. The lower inch of the section was of a pale yellow colour, and 

 contained relatively many fewer manganese grains. In all other re- 

 spects the two layers appeared the same. The lower layer was to the 

 look and touch very much like the Diatomaceous ooze taken in the South 

 Atlantic. It also caked in the same way. 



Sounding 248. 25th March, 1875. 2300 fathoms. Lat, 14° 44' N., 

 long. 142° 13' E. A red or chocolate clay containing : — Much 

 amorphous clayey matter ; many very fine mineral particles ; a 

 great many Eadiolaria and Challengerias ; one or two broken pieces 

 of pelagic Eoraminif era ; many manganese grains. 

 The trawl brought up several pumicestones coated with manganese, 



and some hardened pieces of the bottom. 



Sounding 249. 27th March, 1875. 2475 fathoms. Lat. 17° 29' N., 

 long. 141° 21' E. A red or chocolate clay, containing : — Much 

 amorphous clayey matter ; many fine and some coarse mineral par- 

 ticles — quartz, mica, pumice, &c. ; a few Eadiolarians ; one or two 

 broken pieces of pelagic Eoraminif era ; many manganese grains. 



Sounding 250. 9th March, 1875. 2450 fathoms. Lat. 19° 24' K, 

 long. 141° 13' E. A red clay containing : — Much amorphous clayey 

 matter ; many fine and some rather coarse mineral particles (some 

 of these pieces of areolar pumice of a green colour, and containing 

 white crystals) ; a few Eadiolarians and other siliceous remains ; a 

 few manganese grains. 



Sounding 251. 1st April, 1875. 2500 fathoms. Lat. 22° 1' N., long. 

 140° 27' E. A red clay, same as No. 250. 



Sounding 252, 5th April, 1875. 2425 fathoms. Lat. 26° 29' N., long. 



