100 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 



Residue : 100 per cent : — 



Siliceous Organisms (1 per cent), Sponge spicules. 



Minerals (30 per cent), mean diameter 0.15 mm., angular, pumice, 

 decomposed plagioclase, obsidian, magnetite, manganese grains, augite, 

 olivine, volcanic glass abundant. 



Fine Washings (69 per cent), amorphous clayey matter, with minute 

 mineral particles. 



No. 50. Station 188, 6th December, 1899. 

 Lat. 18° 43' S. ; long. 175° 28' W. ; depth, 1381 fathoms. 



RED CLAY or VOLCANIC MUD : brown, coherent, clayey. 



Calcium carbonate : 16.6 per cent, pelagic and bottom-living Forami- 

 nifera, small Fish teeth, coccoliths, and rhabdoliths. 

 Residue : 83.4 per cent, dark brown, flocculent : — 



Siliceous Organisms (1 per cent), fragments of Radiolaria and Sponge 

 spicules. 



Minerals (30 per cent), angular, mean diameter 0.2 mm., plagioclase, 

 pumice, volcanic glass, magnetite, olivine, augite (?). 



Mne Washings (52.4 per cent), amorphous clayey matter, with minute 

 mineral particles. 



No. 51. Station 191, 7th December, 1899. 

 Lat. 18° 56' S. ; long. 178° 43' W. ; depth, 600 fathoms. 



PTEROPOD OOZE : dirty cream colored, slightly coherent. 



Calcium carbonate : 82.5 per cent, Pteropods, Heteropods, pelagic and 

 bottom-living Foraminifera, small Lamellibranchs and Gasteropods, Fish 

 teeth, Polyzoa, Ostracodes, otoliths, coccoliths, rhabdoliths. Tunicate 

 spicules. 



Residue: 17.5 per cent, reddish brown, flocculent, with black mineral 

 particles : — 



Siliceous Organisms (1 per cent), Sponge spicules, Radiolaria, Diatoms. 



Minerals (10 per cent), angular, mean diameter 0.1 mm., pumice, vol- 

 canic glass, augite, magnetite, olivine, plagioclase. 



Fine Washings (6.5 per cent), amorphous clayey matter, with minute 

 mineral particles and fragments of siliceous organisms. 



