56 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
Pulvinulina, Orbulina) and their fragments form the greater part of the cal- 
cium carbonate, with one or two bottom-living forms (Liloculina depressa) and 
a few Kchinoid spines. 
REsIDUE: 66.67 per cent : — 
Siliceous Organsms (0 per cent); none could be detected. 
Minerals (5 per cent), all the particles are angular, and their mean 
diameter is a little under 0.1 mm. Of determinable mineral particles com- 
mon augite is the most frequent, while felspar is also very abundant, and 
could be accurately determined as labradorite (Ab, An,). There are also 
many minute fragments of magnetite. The remaining portion is represented 
by the brown product of decomposition of some ferro-magnesian mineral. 
The fragment of rock is a hard, vitreous, black, volcanic glass, without any 
trace of crystallization. 
Fine Washings (61.67 per cent), brown, amorphous clayey matter, 
with numerous minute mineral particles. 
No. 25. Station 4517,* 22nd December, 1904. 
Lat. 26° 50.9’ S.; long. 109° 12.5’ W.; depth, 1723 fathoms. 
GLOBIGERINA OOZE: light-brown, slightly plastic, drying into reddish- 
brown lumps that have little coherence. 
CALCIUM CARBONATE: 63.55 per cent, many species of pelagic Foramini- 
fera, including numerous small individuals; one Echinoid spine was detected. 
ResipuE: 36.45 per cent, dark brown : — 
Siliceous Organisms (traces), only a few arenaceous Foraminifera and 
Sponge spicules. 
-Minerals (2.50 per cent), mostly angular ; augite plays the principal role ; 
magnetite comes next in order of abundance, and there are a good many 
microlites of basic plagioclase. Volcanic glass was not observed. 
Fine Washings (33.95 per cent), dark-brown clay with minute mineral 
particles. 
No. 26. Station 4518, 22nd December, 1904. 
Lat. 26° 47.3’ S.; long. 109° 9.3’ W.; depth, 1770 fathoms. 
GLOBIGERINA OOZE: light brown, plastic, but not sticky; reddish- 
brown and slightly coherent when dry. 
CALCIUM CARBONATE: 53.01 per cent, Foraminifera, most of the indi- 
viduals being of small size, and Kchinoid spines. 
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