52 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 



Fine Washings (95.77 per cent), practically pure flocculent clay. The 

 mineral particles present are so small that they cannot be determined ; one 

 or two remnants of Sponge spicules. 



No. 18. Station 4683, 9th December, 1904. 

 Lat. 20° 2.4' S. ; long. 91° 52.5' W. ; depth, 2385 fathoms. 



RED CLAY: the little material available is quite similar to Nos. 16 

 and 17. 



Calcium carbonate : 3 per cent, Pulvinulinidse. 

 Eesidue : 97 per cent : — 



Siliceous Organisms (traces), a few Sponge spicules. 



Minerals (traces) ; the most abundant mineral is phillipsite in crystals, 

 0.03 to 0.04 mm. in length, and 0.01 mm. in breadth ; also a few manga- 

 nese grains. The other mineral particles are too small (0.01 mm. in diam- 

 eter) to be determined, but still they are probably mostly augite, in angular 

 fragments. 



Fine Washings (97 per cent), flocculent reddish-brown clay, with a few 

 minute mineral particles. 



No. 19. Station 4685, 10th December, 1904. 

 Lat. 21° 36.2' S.;long. 94° 56' W. ; depth, 2205 fathoms. 



GLOBIGERINA OOZE: dark brown, plastic and sticky, of mottled 

 appearance, light yellow patches showing in the dark mass ; contains many 

 manganese nodules; reddish and coherent when dried; might be called Red 

 Clay. 



Calcium carbonate: 34.07 per cent — mean of two determinations; 

 Foraminifera and a few Pishes' teeth. 

 Residue : 65.93 per cent : — 



Siliceous Organis^ns (1 per cent). Sponge spicules. 



Minerals (2.5 per cent), angular, mean diameter 0.2 mm., mostly man- 

 ganese grains, and next in order of abundance, palagonite, small fragments 

 of rocks, magnetite, augite, and volcanic glass. 



Fine Washings (62.43 per cent), brown amorphous clayey matter, con- 

 taining a few very small manganese grains and a great number of minute 

 crystalline particles. 



