REPORT ON THE DEEP-SEA DEPOSITS. 
109 
Residue. 
Additional Observations. 
Siliceous Organisms. 
j -3'00 %), Radiolaria, Sponge 
, spicules, Verneuilina pyg- 
■meea, Diatoms. 
Minerals. 
(I'OO %), m. di. O'lO mm., 
angular ; felspar, pyroxene 
or amphibole, magnetite, 
pumice, altered volcanic par- 
ticles. 
Fine Washings. 
(43 '53 %)j fine amorphous 
matter, minute mineral par- 
ticles and remains of siliceous 
organisms. 
The Foraminifera are nearly all jielagic ; both large and i 
small specimens are present, the larger ones being much 
broken. A piece of pumice about the size of a pea came 
up in the sounding tube. About a pint (half a litre) 
of pumice fragments came up in the trawl, varying in 
size from that of a pea to that of a hen’s egg, in most 
cases much decomposed and friable. On one or two 
there were attached small siliceous Sponges. 
‘ 5 ‘00 %), Radiolaria, Sponge 
spicules, Astrorhizidse, Litno- 
lidse. Diatoms. 
(I'OO %), m. di. 0'06 mm., 
angular ; felspar, hornblende, 
augite, magnetite, many small 
fragments of pumice. 
(14'80 %), amorphous matter, 
many small fragments of 
siliceous organisms and 
pumice. 
Only a small quantity of the ooze came up in the sound- 
ing tube, but the dredge was filled with it. On passing 
this through sieves many fragments of pumice were 
obtained, varying much in size, the largest being about 
5 or 6 cm. in diameter ; there were, however, many 
hundreds of small fragments with a diameter of 1 or 2 
mm. This deposit is essentially composed of pelagic 
Foraminifera, the bottom-living species forming only a 
very small portion of the whole mass. Rhabdoliths 
are very rare, Coccoliths very small in size. 
'80 '00%), Radiolaria, Sponge 
j, spicules, one Haplophrag- 
mium globigeriniforme Ob- 
1, served. Diatoms. 
(3'00 %), m. di. O'lO mm., 
angular; felspar, augite, pu- 
mice, magnetite, palagonite, 
lapilli of andesitic rocks, 
bronzite spherule. 
(17 '00 %), a small quantity of 
amorphous matter, with many 
fine fragments of siliceous 
organisms and minerals. 
Besides the many altered volcanic particles there are 
many little aggregations of the bottom difficult to break 
down, also little clusters of rhombohedral crystals of 
carbonate of lime. This is the deepest sounding from 
which deposit has been procured. 
:3'00 %), Radiolaria, Lituolidae, 
fragments of large Coscino- 
discus. 
I 
(5'00 %), m. di. 0'08 mm., 
angular ; magnetite free and 
enclosed in volcanic glass, 
monoclinic and triclinic fel- 
spars, augite, hornblende, 
many fragments of pumice, 
vitreous fragments trans- 
formed into palagonite. 
(85 '89 %), many minute frag- 
ments of pumice and other 
minerals, and some small frag- 
ments of siliceous organisms. 
The trawl brought up a quantity of pumice. The clay at< 
this station presents only some of the. typical characters 
of clay, and appears to be, fundamentally, rather a fine 
mud than a clay, and is composed chiefl}' of the tritu- 
rated particles of pumice. The pumice stones aa-e all 
more or less decomposed and coloured by the hydroxides 
of iron and manganese. In some cases it is impossible 
to determine the nature of these fragments, believed 
to be pumice, even after microscopic and macroscopic 
examination, but in the majority the structure of 
pumice can be recognised in the thin slides. 
3 '00 %), Sponge spicules, 
Radiolaria, Lituolidae. 
(3'00 %), m. di. 0'08 mm., 
angular ; numerous particles 
of pumice and volcanic glass 
splinters (.some brown), plagio- 
clase, felspar, augite, horn- 
blende, magnetite. 
(94 '00 %), fine amorphous 
matter, minute mineral and 
siliceous remains. 
The deposit contains much manganese ; two or three 
small pieces of pumice, about 0'5 cm. in diameter, 
were obtained. The minerals are crystals or fragments 
generally covered with a coating of scoriaceous glass. 
2'00 %), Sponge spicules, 
Radiolaria, Haplophragmium 
latidorsatum. 
(8'00 %), m. di. 0'06 mm., 
angular ; plagioclase often 
coated with a net-work of 
vesicular glass, augite, mag- 
netite, pumice, palagonite, 
manganese grains. 
(90 '00 %), amorphous matter, 
fine mineral particles, and 
remains of siliceous organ- 
isms. 
There is a considerable quantity of manganese in the 
form of little black grains. There are also many pellets 
of pumice from 1 to 5 mm. in diameter. 
3 '00 %), Radiolaria, BMzam- 
mina algseformis, Lituolidae, 
Diatoms. 
(5'00 %), m. di. O'lO mm., 
angular ; pumice, scoriae, 
plagioclase, black or brownish 
volcanic glass, magnetite, 
pyroxene. 
(92 '00 %), much fine amorphous 
chocolate coloured matter, 
minute mineral and siliceous 
remains. 
The deposit does not effervesce with acid. The micro- 
scope reveals only one or two small teeth of fish. 
Particles of pumice and grains of manganese are 
abundant. There are remains of the large cylindrical 
Diatom, Eihmodiscus. 
Admiralty Islands to Yokohama — continued. 
