THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 97 



part of the material soluble in hydrochloric acid is in a crystalline form, 

 apparently reef fragments more or less transformed into dolomite (dolomitic 

 limestone). 



Residue : 66.4 per cent, chocolate colored : — 



Siliceous Organisms (1 per cent), Sponge spicules. 



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

 phillipsite, palagonite, volcanic glass, decomposed plagioclase, manganese 

 grains, some of which attain a diameter of 4 mm., hematite, magnetite, de- 

 composed minerals. 



Fine Washings (35.4 per cent), amorphous clayey matter impregnated 

 with manganese. 



This deposit is most peculiar, and would merit a close examination, but 

 unfortunately little material is available. 



No. 43. Station 156, 2nd November, 1899. 

 Lat. 20° 31' S. ; long. 142° 0' W. ; depth, 2468 fathoms. 

 RED CLAY : very little material, dark brown, with yellow patches, coher- 

 ent, clayey. 



Calcium carbonate : 25.85 per cent, small pelagic and fragments of 

 bottom-living Foraminifera, Echinoid spines, Fish teeth and otoliths, cocco- 

 liths, and other calcareous horseshoe-shaped bodies. 

 Residue : 74.15 per cent, chocolate colored : — 



Siliceous Organisms (1 per cent), Sponge spicules, arenaceous Foramini- 

 fera. 



Aiinerals (30 per cent), angular and rounded, mean diameter 0.15 mm., 

 phillipsite in isolated crystals, twins, and aggregates, manganese grains, 

 plagioclase, volcanic glass, palagonite, augite. (Some of the phillipsite aggre- 

 gates attain a diameter of 0.5 mm., and some of the manganese grains 1 mm.) 

 Fine Washings (43.15 per cent), amorphous clayey matter, with many 

 minute mineral particles. 



No. 44. Station 157, 2nd November, 1899. 



Lat. 20° 46.5' S. ; long. 142° 51' W. ; depth, 2315 fathoms. 



GLOBIGERINA OOZE: very little material, dark brown, with white spots 



(Foraminifera), coherent, clayey, with fragments of decomposed volcanic 



glass impregnated with manganese, the largest being 7 mm. in diameter. 



Calcium carbonate: 41.8 per cent, the mean of two analyses which 



