THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 46 
CALCIUM CARBONATE: 20.46 per cent, Foraminifera, mostly Globigerin- 
ide, the individuals being of very small size, but in a good state of preser- 
vation, and Kchinoid spines. 
ResipuE: 79.54 per cent, earthy brown in color, and very fine grained : — 
Siliceous Organisms (3.5 per cent); Radiolaria are very abundant and of 
large size, and form the greater part of the heavier portion of the residue. 
There are also a good many Diatoms, and some Sponge spicules. 
Minerals (traces) ; the mineral particles are so small and few in number 
that they cannot be all identified. Magnetite, hematite, quartz, and a little 
glauconite could be recognized. Particles having the appearance of horn- 
blende, augite, and zircon may be mentioned, but their identification is very 
doubtful. 
Fine Washings (76.04 per cent); gray, somewhat brownish, matter, very 
clayey, containing a great number of Diatoms, together with a few Sponge 
spicules and minute mineral particles. 
No. 7. Station 4654, 12th November, 1904. 
Lat. 5° 46’ S.; long. 81° 31.9’ W.; depth, 1036 fathoms. 
GREEN MUD: dark green, very plastic and smooth to the touch, drying 
into hard, coherent lumps. The dried material, powdered in a mortar, has 
a vivid light-green color. 
CALCIUM CARBONATE: traces; with acid the deposit gives hardly any 
effervescence, and only one or two pelagic Foraminifera could be detected. 
ResipvE: 100 per cent : — 
Siliceous Organisms (traces), only one or two Sponge spicules and 
Diatoms. 
Minerals (12.5 per cent), angular and rounded, mean diameter 0.15 
mm.; of terrigenous minerals the most common are quartz and felspar. Of 
the latter, two varieties appear to co-exist: some fragments have the optical 
properties of an oligoclase containing 30 per cent of anorthite ; others be- 
long to bytownite. Both these are in fairly large crystals, but, besides, there 
are many microlites belonging presumably to oligoclase. One or two small 
fragments of colorless voleanic glass are also present. Magnetite is repre- 
sented in very small amount, and so also is white mica, in scales that have 
lost much of their transparency. A mineral not often met with, namely, 
chalcedony, is also to be seen, as small rounded fragments exhibiting the 
phenomenon of the black cross between crossed nicols in parallel light. 
