514 Mr. J. Murray on Oceanic Deposits examined 



long. 137° 43' W. A dark chocolate clay containing : — Amorphous 



clayey matter ; many small yellow crystals and pumice ; pieces of 



red cherty-like mineral ; many manganese grains and pellets ; a few 



remains of pelagic Foraminifera. 



The trawl brought up some mud and over a bushel of manganese 



nodules and some pieces of pumice. Amongst the nodules were : — Many 



sharks' teeth, som3 deeply imbedded in manganese ; eight tympanic 



bones of Cetaceans, some deeply imbedded in manganese. Some nodules 



had a nucleus of bone, some of pumice, some a cherty-like mineral with 



agate bands. 



Sounding 307. 16th October, 1875. 2335 fathoms. Lat. 33° 29' S., 

 long. 133° 22' W. In upper part of tube, 2 inches, a dark choco- 

 late clay containing : — Much amorphous clayey matter ; many small 

 yellow crystals, pieces of a cherty-like mineral, and many manganese 

 grains and pellets ; a few remains of pelagic Eoraminifera. In lower 

 part of the tube, 5 inches, a light brown clay containing, besides the 

 things in the upper layer : — Many more pelagic Foraruinifera, and 

 immense numbers of Coccoliths. 

 The lighter colour of the lower layers appeared to be due to the greater 

 abundance of carbonate-of-lime organisms, and consequently less abun- 

 dance of manganese particles. 



This arrangement of the contents of the sounding-tube is the reverse 

 of that on the 9th inst. 



The trawl brought up over a bushel of nodules &c, as : — 

 Over 100 sharks' teeth, \ 



About 30 tympanic bones of Cetaceans, I All these had a more or 

 Portions of other bones, > less coating of per- 



One granitic pebble, i oxide of manganese. 



Grey concretions of the bottom. / ' > .. 



Also some nodules with no apparent nucleus, and some with a hard 

 cherty yellow mineral in the centre. 



Sounding 308. 19th October, 1875. 2400 fathoms. Lat. 36° 33' S., 

 long. 132° 55' W. A dark chocolate clay containing : — Amorphous 

 clayey matter ; many manganese grains ; small yellow crystals, 

 rounded pellets of a red-brown mineral; a few pieces of pelagic 

 Foraminifera. 

 The remains of the Foraminifera appeared to be confined to the upper 



layer. 



Sounding 309. 21st October, 1875. 2600 fathoms. Lat. 40° 8' S., 

 long. 132° 56' W. A chocolate clay containing : — Amorphous clayey 

 matter ; many manganese grains and pellets ; small crystals, same 

 as in late soundings, but had not the yellow colour ; angular pieces 

 of a cherty-like mineral ; small teeth of sharks. 



