516 Mr. J. Murray on Oceanic Deposits examined 



contained less carbonate of lime. About a dozen manganese nodules and 

 two shark's teeth came up in the trawl. Two nodules had a nucleus of 

 obsidian (?), outside this several agate-like bands, and then many layers 

 of the peroxide of manganese. Two other nodules, from the structure 

 and presence of lime, appeared to be formed on a nucleus of bone. One 

 of the shark's teeth was deeply imbedded, the other was not. 

 Sounding 315. 3rd November, 1875. 2270 fathoms. Lat. 39° 22' S., 

 long. 98° 46' "W. A dark chocolate clay containing : — Much amor- 

 phous clayey matter ; many manganese particles, small yellow crys- 

 tals, red, white, and black mineral particles (quartz and particles of 

 volcanic sand ?). In the upper layers there were a good many 

 remains of pelagic Foraminifera and a few Coccoliths, but these 

 were almost wanting in the deeper layers. 



Sounding 316. 5th November, 1875. 1500 fathoms. Lat. 38° 7' S., 

 long. 94° 4' W. A small quantity of bottom came up which indi- 

 cated a Globigerina-ooze of a brown colour containing : — Many 

 pelagic Foraminifera, Cypridina-v&lves, and EcMni-sipm.es ; many 

 manganese particles, and a good many rather coarse sandy particles 

 of a green colour (serpentine ?) ; a few Eadiolaria. 

 Most of the finer portions of the bottom appeared to have been washed 

 out of the tube on the way up. 



The tow-nets at the trawl contained many particles of a green mineral 

 and one pebble of the same nature (serpentine ?), with a coating of man- 

 ganese. 



Sounding 317. 9th November, 1875. 1825 fathoms. Lat. 38° 6' S., 

 long. 88° 2' W. A Globigerina-ooze of a brown colour containing : 

 — Many pelagic Foraminifera, Coccoliths, and Rhabdoliths ; a good 

 many manganese particles and pieces of a red and yellow mineral ; 

 one Eadiolarian noticed ; some amorphous clayey matter. 

 In the lower end of the tube the bottom was of a much darker colour, 



and contained fewer Foraminifera and more manganese and amorphous 



matter. 



In the trawl there was some mud, all of a brown colour, same as in the 



upper part of the sounding-tube. In the sifting were many pellets of 



manganese and pieces of a flinty-like mineral. 



Sounding 318. 11th November, 1875. 1775 fathoms. Lat. 37° 29' S., 

 long. 83° 7' W. A Globigerina-ooze of a brown colour. No bottom 

 came up in the tube. 

 I here copy in extenso from my Journal notes so far as they relate to 

 the bottom in the trawl : — 



" The trawl came up in the afternoon fouled, but in it were three or 

 four quarts of manganese nodules varying from the size of a hen's egg to 

 that of a pea. 



" The weights (300 fathoms from the trawl) were all scored and marked 



