THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 69 



Minerals (traces), angular ; mean diameter 0.1 mm. ; felspar, a little 

 aiigite, magnetite, phillipsite, and manganese grains. 



Fine Washings (34.10 per cent), chocolate-brown clay, with microscopic 

 manganese grains and many minute crystals of phillipsite. 



No. 48. Station 4739, 26th January, 1905. 

 Lat. 22° 11.1' S. ; long. 183° 21' W. ; depth, 2042 fathoms. 



GLOBIGERINA OOZE : light brown, earthy in texture, incoherent when 

 dried ; many Foraminifera visible to the naked eye. 



Calcium carbonate: 58.62 per cent, pelagic Foraminifera, with a few 

 bottom-living forms (Rotalidse). 



Residue: 41.38 per cent : — 



Siliceous Organisms (traces), arenaceous Foraminifera, Sponge spicules, 

 Radiolaria. 



Minerals (0.75 percent) ; two kinds of particles are present — (1) actual 

 mineral particles, 0.1 mm. in mean diameter, angular and rounded, felspar, 

 augite, olivine, volcanic glass (always angular), a good many small yellow 

 crystals of phillipsite (0.01 mm. by 0.03 mm.), and a few particles of hema- 

 tite ; and (2) reddish, shapeless, highly magnetic particles, nearly 1 mm. in 

 diameter, doubtless formed of magnetite, the surface of which is oxidized, 

 and making up about one-third of the minerals ; there are also a few man- 

 ganese grains, some exceeding 2 mm. in diameter, and a good many cosmic 

 spherules, with a mean diameter less than 0.1 mm. 



Fine Washings (40.63 per cent), flocculent clay, colored dark brown by 

 numerous minute manganese grains, with other very small mineral particles, 

 including phillipsite. 



No. 49. Station 4526,* 27th January, 1905. 

 11 miles N. E. of Mt. Duff, Manga Reva ; depth, 2070 fathoms. 



GLOBIGERINA. OOZE: light brown, with yellowish tinge, not sticky, 

 hardly plastic ; the dried lumps crumble imder the action of water. 



Calcium carbonate : 75 per cent, pelagic Foraminifera, including many 



small shells, with a few bottom-living forms (Rotalidse and Biloculina depressa) . 



Residue : 25 per cent, dark brown : — 



Siliceous Organisms (traces), only one or two arenaceous Foraminifera. 



Minerals (0.25 per cent), angular ; mean diameter 0.3 mm. ; plagio- 



