THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 55 



Truncatulina ungeriana (d'Orb.). 

 lobatula (W. & J.). 

 Pulvinulina micheliniana (d'Orb.). 



" crassa (d'Orb.). 



" mewarfZn (d'Orb.). 



" tumida, Brady. 



" exiffua, Brady. 



" mnhonata. Ess. 



" favus, Brady. 



" karsteni (Rss.). 



" canariensis (d'Orb.). 



Nonionina umhilicatula (Montag.). 



Glohigerina infiata, d'Orb. 



" cequilateralis, Brady. 



Orbulina universa, d'Orb. 

 Pullenia quinqueloba, Rss. 



" sphceroides (d'Orb.). 

 Sphcuroidina dehiscens, P. & J. 

 Candeina nitida, d'Orb. 

 Cymbalopora poeyi (d'Orb.) (?). 

 Discorbina exiviia, Hantk. (?). 



" berthdoti (d'Orb.), var. baconica, 



Hantk. 

 Discorbina araucana (d'Orb.). 

 Truncatulina wuellerstorfi (Schw.). 



No. 23. Station 4514* (hydrographic), 15th December, 1904. 

 Lat. 27° 16' S. ; long. 108° 56' W. ; depth, 1552 fathoms. 



VOLCANIC SAND : brown, having an earthy texture and a mottled appear- 

 ance due to the presence of yellow patches; incoherent and not plastic 

 ■when wet. A decomposed soft piece of pumice (li inches in diameter), 

 coated with manganese, was picked out. 



Calcium carbonate : 11.81 per cent, various species of pelagic Foramini- 

 fera ; other organisms were not detected. 

 Residue: 88.19 per cent:— 



Siliceous Organisms (traces), a few Sponge spicules sticking to the sur- 

 faces of some of the larger mineral particles. 



Minerals (19.48 per cent), principally fragments of decomposed pumice 

 and grains of the oxides of iron and manganese (1 to 2 mm. in diameter), the 

 latter containing much more iron than manganese. The actual mineral par- 

 ticles are angular, and have a mean diameter of 0.2 mm. ; they are repre- 

 sented by common augite and olivine, and by plagioclase particles, which 

 could not be accurately determined ; there is also the yellow, opaque product 

 of decomposition of some ferruginous mineral. 



Fine Washings (68.71 per cent), mostly fine mineral particles, with a 

 very little clayey matter. 



No. 24. Station 4516,* 22nd December, 1904. 

 Lat. 26° 54.8' S. ; long. 109° 16.4' W. ; depth, 1627 fathoms. 



GLOBIGERINA OOZE: fine-grained, plastic, gray, drying into chalky 

 lumps having little coherence ; contains one angular rock fragment a quarter 

 of an inch in diameter. 



Calcium carbonate: 33.33 per cent; pelagic Foraminif era (G^fo%mna, 



