THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 75 
bottom-living, but mostly pelagic: Globigerina and Pulvinulina; these shells are 
all colored reddish-brown by oxide of iron. As the clayey matter has dis- 
appeared, an estimation of the carbonate of calcium would have been useless. 
Minerals (traces), angular; mean diameter 0.02 mm., quartz and mag- 
netite are present in equal quantities; one or two greenish particles may be 
attributed toa member of the chlorite family. 
Stiliceous Organisms; Sponge spicules are the only true siliceous or- 
ganisms ; there are also a good many yellowish and brown imperfect casts of 
Foraminifera. 
Station 4642, 7th November, 1904. 
Lat. 1° 30.5'S. ; long. 89° 35’ W.; depth, 300 fathoms. 
CALCAREOUS SAND: very little material,—incoherent sand, formed of 
fragments (mean diameter, 2mm.) of Lamellibranch and Gasteropod shells, 
accompanied by fragments of Corals, and entire specimens of surface and 
bottom-living Foraminifera, together with young individuals of Gasteropoda. 
Very few minerals are present; plagioclase, augite, a red product of the 
decomposition of some ferruginous mineral, and a little magnetite. 
Station 4693, 14th December, 1904. 
Lat. 26° 30.1'S.; long. 105° 45.2'W.; depth, 1142 fathoms. 
GLOBIGERINA OOZE: gray, granular, incoherent, with many irregular 
fragments of manganese nodules; some of the Foraminifera (especially 
Orbulina universa) are visible to the naked eye. 
A few Sponge spicules and arenaceous Foraminifera were observed. 
Many fragments of pumice and other volcanic rocks, and fragments of 
manganese nodules, are present; the mineral particles observed are angu- 
lar, with a mean diameter of 0.3 mm.; augite, plagioclase, green chlorite, 
with minute splinters of volcanic glass, also a brown opaque ferruginous 
product of the decomposition of some basic mineral, and a little magnetite. 
Station 4723, 16th January, 1905. 
Lat. 10° 14.3'S.; long. 107° 45.5’ W.; depth not mentioned. 
GLOBIGERINA OOZE: the material is very granular and incoherent; 
principally pelagic Foraminifera, with many small individuals; a few bottom- 
living forms (Rotalide), a few Sponge spicules and Radiolaria; and a few 
manganese grains, 0.1 to 0.5 mm. in diameter, angular fragments of augite, 
and one or two splinters of volcanic glass. 
