THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 109 



Residue : 33.4 per cent, reddish brown, flocculent : — 



Siliceous Organisms (10 per cent), Sponge spicules, Radiolaria. 

 Minerals (5 per cent), angular, mean diameter 0.1 mm., pumice, vol- 

 canic glass, plagioclase, augite, olivine, magnetite, chloritic mineral. 



Fine Washings (18.4 per cent), amorphous clayey matter, with small 

 mineral particles less than 0.05 mm. in diameter, and splinters of siliceous 



organisms. 



No. 76. Station 245, 18th February, 1900. 



Lat. 9° 31' N. ; long. 149° 36' E. ; depth, 2735 fathoms. 



EEDCLAY : reddish brown, plastic, coherent. 



Calcium carbonate : 9.1 per cent (mean of two analyses which gave 

 9.65 and 8.50 per cent respectively), pelagic Poraminifera (mostly thin and 

 broken), bottom-living Foraminifera, Echinoid spines, Fish teeth. 

 Residue : 90.9 per cent, reddish brown : — 



Siliceous Organisms (2 per cent). Sponge spicules, Radiolaria, arena- 

 ceous Foraminifera. 



Minerals (5 per cent), angular, mean diameter 0.15 mm., felspar 

 (plagioclase), augite, olivine undergoing decomposition, phillipsite, decom- 

 posed volcanic glass, manganese grains, pumice (the largest particle about 

 2 mm. in length). 



Fine Washings (83.9 per cent), amorphous clayey matter, with minute 

 mineral particles and fragments of siliceous organisms. 



No. 77. Station 246, 19th February, 1900. 

 Lat. 10° 34' N. ; long. 148° 25' E. ; depth, 2993 fathoms. 

 RED CLAY : chocolate brown, plastic, coherent. 



Calcium carbonate : 5 per cent, pelagic Foraminifera. 

 Residue : 95 per cent, brown : — 



Siliceous Organisms {1 per cent), Sponge spicules, fragments of Radiolaria. 

 Minerals (10 per cent), angular, mean diameter 0.1 mm., palagonitic 

 substance abundant, decomposed plagioclase, augite, apparently decomposed 

 olivine, manganese grains. 



Fine Washings (84 per cent), amorphous clayey matter, with minute 

 mineral particles. 



Appended are brief descriptions of those samples which appear to have 

 been subjected to a certain amount of washing during the process of collec- 

 tion, and of one unlabelled sample. 



