i 
KEPOET ON THE DEEP-SEA DEPOSITS. 
Ill 
lent. 
68 
■00 
■00] I (So 
— ■ 
Residue. 
Additional Observations. 
Siliceous Organisms. 
Minerals. 
Fine Ayashings. 
0 %), Eadiolaria, Astror- 
izidfe, Trochammina trul~ 
ssata, Diatoms. 
(10 ■00%), m. di. 0^10 mm., 
angular ; almost entirely 
composed of microscopic 
splinters of brown volcanic 
scoriaceous glass (volcanic 
ash), plagioclase, magnetite. 
(82 ‘00 %), much amorphous 
matter, fine mineral and 
siliceous remains. 
A considerable quantity of the deposit was obtained in 
the tube. The minerals consist mainly of broken down 
scoriae. In the trawl were about a dozen pieces of 
pumice stone, averaging an inch (25 mm.) in diameter ; 
these fragments are impregnated with manganese and 
overgrown with Hyperaminina vagans ; to one was 
attached a small Brachiop>od. 
00 %), Eadiolaria, Astror- 
izidae, Lituolid®, Gaudryina 
phonella, Diatoms. 
(lO'OO %), m. di. O'lO mm., 
angular ; pumice fragments, 
scoriae, felspar, plagioclase, 
hornblende, augite, magne- 
tite, altered microscopic frag- 
ments of volcanic rocks. 
(75'00 %), much fine amorphous 
matter, minute mineral and 
siliceous remains. 
The upper portion of the deposit was red, the lower a 
blue colour. A great many Diatoms and Eadiolaria 
are present ; one fragment of pumice, 0 '5 cm. in dia- 
meter, was noticed. 
) %), Sponge spicules, frag- 
Lents of Eadiolaria, a few 
ists. Diatoms. 
(80'00 %), m. di. 0'20 mm., 
angular ; felspar, plagioclase, 
magnetite, augite, horn- 
blende, glauconite, quartz, 
fragments of volcanic glass 
and pumice. 
(13'7l %), a small quantity of 
amorphous matter, minute 
particles of volcanic minerals 
aud siliceous organisms. 
Some of the mineral particles are coated with manganese. 
Some fragments of rocks measure about 0‘5 cm. in dia- 
meter. Among the minerals there are a large number of 
lapilli of black volcanic glass more or less rounded and 
vesicular, measuring from 1 to 2 mm. in diameter. A 
few pale green casts of Foraminifera remained after 
treatment with acid. 
00 %), Sponge spicules, 
'aplophragmium canariensis, 
iatoms. 
(50’00 %), m. di. O’lO mm., 
angular and rounded ; quartz, 
felspar, white and- green mica 
sometimes altered, horn- 
blende, rarely augite, zircon, 
chlorite. 
(28 ■SS %), fine mineral particles, 
amorphous matter, and sili- 
ceous remains. 
The mudi proper shows only one or two points of efferves- 
cence when treated with dilute acid. Mixed with the 
mud are large Lamellibranch shells, twigs, &c. A 
great many Diatoms are present. The felspar is often 
kaolinised. 
The dredge brought up several rounded fragments of 
rocks- and irregular masses of conglomerate, the latter 
made up of smaller rook fragments cemented together 
by calcareous organisms ; all these were overgrown 
with Serpula, Balanus, Polyzoa^ Corals, and Molluscs. 
0 %), Eadiolaria, Sponge 
iicules. Diatoms. 
(40 '00 %), m. di. 0^10 mm., 
rounded and angular ; quartz, 
plagioclase, orthoclase, altered 
felspar, white mica, horn- 
blende, tourmaline, zircon. 
(5371 %), fine mineral particles, 
some clayey matter, and 
remains of siliceous organisms. 
These and other soundings in the Inland Sea gave a 
sticky Blue Mud. The washings of a large quantity 
of this mud consisted of a number of broken and dead 
Gasteropod, Lamellibranch, and Dentalium shells with 
a few Miliolid® and Eotalid®. There are many 
Diatoms present in the mud as well as on the surface. 
Shells of pelagic Foraminifera and Pteropods are 
apparently absent in these deposits.. 
0 %), Eadiolaria, Sponge 
ncules, Diatoms. 
(15‘00 %), m. di. 0'06 mm., 
angular, rounded, felspar, 
mica, magnetite, glassy 
particles, coloured altered 
glassy particles, hornblende. 
(82'00 %), fine mineral frag- 
ments, Diatom and other 
siliceous remains, a small 
([iiantity of fine amorphous 
material. 
Only traces of the bottom came up on the outside 
of the tube, but in the water-bottle was a quantity 
of Blue Mud, having streaks here and there of a red 
tinge. The great mass of the washings consists of fine 
mineral particles, remains of Diatoms and Eadiolaria. 
Only one or two Olohigerina shells were observed and 
these small. Among the Eadiolaria were noticed several 
specimens of Challengeria tizardi. 
0 %), Eadiolaria, Sponge 
ncules, casts of Foraminifera, 
iatoms. 
(60^00 %), m. di. 0'20 mm., 
angular; plagioclase, felspar, 
quartz, augite, magnetic par- 
ticles, pumice, glauconite, 
fragments of volcanic rocks. 
(30^00 %), fine amorphous 
matter, minute mineral and 
siliceous remains. 
No mud was obtained from the sounding tube or trawl, 
but in the trawl were three or four pieces of pumice, 
and about the bases of some Actinias were traces of the 
bottom. Worm-tubes were present. After treatment 
with acid a good many light and dark green casts of 
Foraminifera are observed. The percentages have been 
approximated, there being too small a quantity for 
analysis. 
Admiraltj" Islands to 
Yokohama — continued. Off Japan. 
