THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 53 



No. 20. Station 4687, 11th December, 1904. 

 Lat. 22° 49.5' S. ; long. 97° 30.6' W. ; depth, 2184 fathoms. 



RED CLAY : dark chocolate-brown clay, plastic and sticky, drying into hard 

 lumps ; a few Foraminifera visible to the naked eye as white specks. 



Calcium carbonate : 8.13 per cent; pelagic Foraminifera, mostly broken, 

 but individuals belonging to the genus Piiloinulina are recognizable ; also a 

 good many Fishes' teeth. 



Residue : 91.87 per cent : — 



Siliceous Organisms (traces), a few Sponge spicules. 



Minerals (traces), a few particles from 0.1 to 0.3 mm. in diameter, with 

 some much smaller ; manganese grains and palagonite are the most frequent ; 

 augite, volcanic glass, and phillipsite were also detected, but are very rare. 



Fine Washings (91.87 per cent), dark-brown clay with many microscopic 

 crystals of phillipsite, fragments of augite and other particles undeterminable, 

 and of Sponge spicules. 



No. 21. Station 4689, 12th December, 1904. 

 Lat. 24° 5' S. ; long. 100° 20' W. ; depth, 2185 fathoms. 



RED CLAY: dark chocolate-brown clay, plastic and sticky, very hard when 

 dried ; fragments of Foraminifera visible to the naked eye. 



Calcium carbonate: 13.94 per cent, pelagic Foraminifera and Pishes' 

 teeth. 



Residue : 86.06 per cent : — 



Siliceous Organisms (small traces), only a few fragmentary Sponge 

 spicules could be detected. 



Minerals (traces), angular and rounded, ranging from 0.01 to 0.10 mm. in 

 diameter; plagioclase and augite can be recognized, with small isolated 

 crystals of phillipsite, 0.06 mm. long and 0.01 mm. broad. A little magnet- 

 ite is present, but the other particles are too minute for determination. 



Fine Washings (86.06 per cent), brown clayey matter with minute 

 mineral particles. 



No. 22. Station 4691, 13th December, 1904. 

 Lat. 25° 27.3' S. ; long. 103° 29.3' W. ; depth, 1939 fathoms. 



GLOBIGERINA OOZE : light brown, plastic and sticky, drying into slightly 

 coherent gray lumps, with a reddish tinge. 



