64 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 



Mwe?'ak (0.10 per cent approximately), angular, ranging from under 

 0.03 to 0.05 mm. in diameter; augite, plagioclase (probably labradorite), 

 magnetite, brownish volcanic glass are the most abundant, with a few 

 manganese grains and particles of some chloritic mineral, greenish and 

 crypto-crystalline. 



Fine Washings (54.30 per cent), brown flocculent clay, with many frag- 

 ments of siliceous organisms and minute mineral particles. 



No. 39. Station 4521,* 11th January, 1905. 

 Lat. 2° 14.3' S. ; long. 92° 29.9' W. ; depth, 1871 fathoms. 

 GLOBIGERINA OOZE: gray and plastic when wet; white, chalky, and 

 coherent when dried. 



Calcium carbonate : 45.01 per cent, principally pelagic Foraminifera, 

 mostly broken shells, with many bottom-living forms {llotalia), and a few 

 Echinoid spines belonging to young individuals. 

 Residue : 54.99 per cent : — 



Siliceous Organisms (traces) ; Radiolaria are the most abundant, Sponge 

 spicules and Diatoms being poorly represented. 



Minerals (very few), angular ; mean diameter imder 0.02 mm. ; augite, 

 with a few manganese grains and flakes of hematite, can alone be identified ; 

 the other particles are too small to be determined. 



Fine Washings (54.99 per cent), gray clay containing many fragments 

 of siliceous organisms and minute mineral particles. 



No. 40. Station 4522,* 11th January, 1905. 

 Lat. 2° 42.4' S. ; long. 93° 30' W. ; depth, 1924 fathoms. 

 GLOBIGERINA OOZE : light gray, plastic and slightly sticky ; coherent 

 with chalky appearance when dried. 



Calcium carbonate : 55.90 per cent, shells of pelagic and bottom-living 

 Foraminifera, and their comminuted fragments, and Echinoid spines. 

 Residue : 44.10 per cent : — 



Siliceous organisms (traces), Radiolaria, Diatoms, and Sponge spicules. 

 Minerals (traces), angular ; mean diameter 0.02 mm. ; the most abun- 

 dant is an olive-green, crypto-crystaUine, chloritic mineral, with a few parti- 

 cles of augite, and one or two manganese grains. 



Fine Washings (44.10 per cent), light-gray clay, slightly greenish, half 

 its weight consisting of remains of siliceous organisms, with a few minute 

 mineral particles. 



