506 Mr. J. Murray on Oceanic Deposits examined 



Japan to Honolulu, Sandivich Islands. 



Sounding 258. 17th June, 1875. 1875 fathoms. Lat. 34° 37' 1ST., long. 



140° 32' E. A blue mud containing : — Much amorphous blue clayey 



matter ; many fine and some coarse mineral particles of a black, red, 



and green colour ; many remains of Diatoms, Eadiolaria, and Chal- 



lengerias ; one or two Eormanifera and Coccoliths. 



In the trawl were several large pieces of pumicestone, hardened pieces 



of the bottem honej^combed by worm-tubes, a few large Pteropod shells, 



a Cephalopod's beak, and two vertebrae of fish; the surface of the 



pumicestones was in most cases black with peroxide of manganese ; so also 



was the surface of the worm-tracks in the hardened pieces of the bottom. 



fathoms. , t 



Sounding 259. 18th June, 1875. 3900. Lat. 35 18 N., long. 144 8 E. 

 „ 260. 19th „ „ 3625. „ 35 18 N., „ 147 9 E. 

 Each a red clay containing : — Much amorphous clayey matter ; 

 many fine and some rather coarse mineral particles, black and 

 white in colour, and pieces of pumice ; very many remains of Badio- 

 larians, Diatoms, and Challengerias. 



Sounding 261. 21st June, 1875. 2900 fathoms. Lat. 35° 20' N., long. 

 153° 39' E. A red clay, the lower layers lighter in colour than the 

 top ones, containing : — Amorphous clayey matter; many fine mineral 

 particles and a few rather large pieces of pumicestone ; very many 

 remains of Diatoms, Eadiolarians, and Challengerias ; a few manga- 

 nese grains. 

 The remains of siliceous organisms made up nearly a half of this 



bottom in bulk. 



Sounding 262. 23rd June, 1875. 2300 fathoms. Lat. 35° 41' N., long. 

 157° 42' E. A red clay, the upper layers soft, the lower ones com- 

 pact and of a lighter colour, containing : — Much amorphous clayey 

 matter ; man}'- fine mineral particles, some of them black, but the 

 majority apparently broken-down pieces of pumice; very many 

 Eadiolarians, Diatoms, and Challengerias ; a few pelagic Eoramini- 

 fera and Coccoliths. 

 The trawl brought up many large and some small pieces of pumice, 



most of them having a slight coating of peroxide of manganese. 



fathoms. , , 



Sounding 263. 24th June, 1875. 2575. Lat. 35 29 N., long. 161 52 E. 



264. 26th „ „ 2800. „ 35 24N., „ 166 35 E. 



265. 28th „ „ 2900. „ 35 22 N., „ 169 53 E. 



266. 30th „ „ 2775. „ 36 23N., „ 174 31 E. 

 In all these a red or chocolate clay containing : — Much amorphous 



clayey matter ; very many fine mineral particles, being apparently 

 broken-down pieces of pumice, also some rather large pieces of 

 pumice (the size of a pea), which had frequently a coatiiig of man- 



