REPORT ON THE DEEP-SEA DEPOSITS. 
125 
RESIDUE. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
Additional Observations. 
4 (2 '00 %) Sponge spicules, As- 
trorhizidie, Lituolid.se, arena- 
‘ ceous Testularidse, Diatoms. 
3 (2 '00 %), Sponge spicules, As- 
trorMzidse, Lituolidas, arena- 
ceous Textularidse, Diatoms. 
4 ,(2'00 %), Radiolaria, Sponge 
spicules, Bhizammi'm, Litu- 
olidse, easts of calcareous 
organisms. Diatoms. 
2 '00 %), Radiolaria, Sponge 
spicules, Astrorhizidse, Litu- 
oMae. 
•00 %), Sponge spicules, 
Radiolaria, BMmmnnina 
algmformis, Lituolidse, Dia- 
toms. 
(15'00 %), m. di. O'lO mm., 
angular; volcanic glass, plagio- 
clase, felspar, magnetite, horn- 
blende, augite, mica. 
(40'00 %), m. di. 0'08 mm., 
angular; altered volcanic glass, 
plagioclase, felspar, magnetite, 
augite, black volcanic particles 
some of them magnetic. 
(25‘00 %), m. di. O'lO mm., 
angular ; plagioclase, augite, 
hornblende, mica, olivine, 
magnetite, fragments of vol- 
canic rocks, manganese grains. 
(50'00 %), m. di. 0‘12 mm., 
angular and rounded ; mag- 
netite, palagonite, horn- 
blende, augite, felspar, 
pbiUipsite, black mica. 
(50'00 %), m. di. 0’15 mm., 
rounded ; palagonite, plagio- 
clase very abundant, augite 
microlitbs, magnetic particles, 
great number of small rounded 
red transparent grains some of 
them palagonite, or altered 
oUvine, or felspar coated with 
iron and manganese. 
(60 ‘34 %), many fine mineral 
fragments, amorphous matter, 
and remains of siliceous organ- 
(38 '53 %), many fine mineral 
particles, amorphous matter, 
and minute remains of siUceous 
organisms. 
(19 '64 %), amorphous matter, 
fine mineral and siliceous 
(48 "00 %), amorphous red 
coloured matter, many fine 
mineral particles, and remains 
of siliceous organisms. 
(48 ‘00 %), much fine red or 
chocolate coloured matter, 
many fine mineral fragments, 
and remains of siliceous 
organisms. 
A considerable quantity of the mud was obtained, similar 
in every respect to the last. The upper layer was 
distinctly red. 
The deposit is similar to the three preceding ones, the 
minerals being finer and more angular. There was a 
red coloured surface layer in this as in the last. 
Two soundings were taken. After treatment with acid 
there remain very perfect casts of the organisms in a 
red coloured material which also covers the shells. All 
the mineral particles are covered with a thin coating 
of manganese and iron. In the washings from the 
tow-net there were some fragments of volcanic rock in 
a high state of decomposition. There were also in the 
tow-net two or three manganese nodules, one about two 
inches (5 cm. ) long and very irregular. These nodules 
seem to be formed of portions of the bottom and are 
perforated in all^ directions by worm-tubes. In the 
sounding tube was a piece of wood perforated by 
worms. One of the nodules had a nucleus composed of 
clay and of volcanic ashes; among this volcanic debris 
were fragments of green hornblende, reddish augite, 
plagioclase, and magnetite. These minerals are im- 
bedded in a mass which appears in some places to be 
zeolitic. 
No deposit was obtained in or on the sounding tube. In 
the bag of the trawl, however, there were about two 
gallons (9 litres) of Red Clay. In the washings there was 
a great number of dark red and brown spherical and 
irregular bodies, which are coated with a substance of 
a zeolitic nature. In the trawl was an immense 
number of manganese nodules and sharks’ teeth. Some 
of the manganese nodules , measure 18x12x3 inches 
(45 X 30 X 7 '5 cm. ). These, along with most of the 
smaller ones, have only a slight coating of manganese, 
the interior being filled with a volcanic tufa. Among 
the nodules are several fragments of pumice passing 
into clayey matter. The nodules were overgrown with 
Hyperammina vagans and other Rhizopods. There 
appears to be evidence that volcanic disturbances 
have taken place at the bottom near this locality. 
Only a small quantity of the deposit, similar in every 
respect to that obtained at the previous station, came 
up in the tube. The greater part of the washings was 
composed of the red and yellow rounded bodies noticed 
on the 6th. There were many fragments of manganese, 
and several small pieces of pumice. 
r < 
I 
Off Tahiti — continued. Tahiti to 
