REPOET ON THE DEEP-SEA DEPOSITS. 
71 
RESIDUE. 
Additional Obseevations. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
)0 %), a few Sponge spicules, 
ne or two Kadiolaria, Litu- 
lidae, imperfect brown casts. 
(I'OO %), m. di. 0'12 mm., 
angular and rounded ; quartz, 
hornblende, felspar, mica, 
augite, magnetite, a few glassy 
volcanic particles. 
(57' 37 %), many very fine 
mineral particles mixed with 
amorphous matter, and a few 
minute fragments of siliceous 
spicules. 
Many of the shells are macroscopic, but are much broken 
up. Some of the mineral particles attain a diameter of 
2 mm. 
)0 %), Sponge spicules, Litu- 
didee. 
(25'00 %), m. di. 0‘08 mm., 
angular and rounded ; quartz, 
mica, felspar, hornblende, 
pumice, glassy volcanic par- 
ticles. 
(53 '21 %), amorphous matter 
mixed with many tine mineral 
particles. 
Quartz is the principal mineral in this deposit ; the smaller 
particles are angular, but when the grains are large 
they are rounded. Mica is abundant, and plagioclase 
is present in some quantity ; pumice rarely occurs. 
Some of the grains attain a size of 1 mm. 
)0 %), a few fragments of 
■ponge spicules, Lituolidse. 
(25'00 %), m. di. 0‘13 mm., 
angular; quartz, mica, felspar, 
hornblende. 
(68 '25 %), amorphous matter, 
many fine mineral particles, 
a few minute fragments of 
siliceous spicules. 
The felspar is generally kaolinised. 
)0 %), a few Sponge spicules, 
.strorhizidse, Lituolidae. 
1 
(25 ’00 %), m. di. 0'07 mm., 
angular and rounded ; quartz, 
mica, felspar. 
(45 '28 %), amorphous matter, 
very many minute mineral 
particles, a few fragments of 
siliceous spicules. 
The amorphous matter in this deposit is small in quantity 
compared with the mineral particles ; these latter form 
the essential part of the residue, and their dimensions 
vary from 1 to 0'02 mm. The quartz particles are 
generally angular, rarely rounded, and are the most 
abundant of the minerals in this deposit. Mica is also 
abundant ; felspar is frequent and sometimes kaolinised. 
Many of the shells are macroscopic although much 
broken up. 
0 %), a few Sponge spicules, 
lituolidae. 
1 
(I'OO %), m. di. 0'15 mm., 
rounded and angular ; quartz, 
mica, felspar, hornblende. 
(47 '35 %), amorphous matter, 
many minute mineral par- 
ticles, and a few fragments of 
siliceous spicules. 
A few of the pelagic shells are macroscopic. The felspar 
in some cases is kaolinised. Note that in all the 
deposits along this coast Radiolaria are exceedingly 
rare, and glauconite nearly, if not quite, absent. 
iO %), Sponge spicules, and a 
|w Diatoms. 
1 
(45 '00 %), m. di. 0'40 mm., 
rounded and angular; quartz, 
felspar, magnetite, horn- 
blende, mica, minute rock 
fragments, grains of glau- 
conite. 
(23 '10 %), amorphous flocculent 
matter, many minute mineral 
particles, and fragments of 
siliceous organisms. 
In some places the deposit is a quartz sand ; in others a 
mud containing all the above-mentioned material, along 
with fine amorphous matter. Many of the organisms 
are macroscopic. 
|0 %), a few siliceous 
licules, red casts of pelagic 
Draminifera, AstrorMza, 
(I'OO %), m. di. 0'06 mm., angu- 
lar ; quartz, mica, monoclinic 
and triclinic felspars, horn- 
blende, glassy volcanic frag- 
ments, augite. 
(51 '57 %), amorphous matter 
and very many fine mineral 
particles. 
Some of the quartz grains are rounded and covered with 
limonite. The particles of felspar are in some cases 
kaolinised. Scales of mica are abundant, having some- 
times a diameter of 0 '2 mm. ; some silver-white scales 
are probably muscovite. Dredge-rope earned away. 
) %), a few fragments of 
longe spicules. 
(I'OO %), m. di. 0'06 mm., angu- 
lar and rounded; quartz, fel- 
spar, augite, hornblende, 
pumice, a few grains of man- 
ganese. 
(62 '07 %), amorphous matter, 
with a great many fine min- 
eral particles. 
Many of the quartz grains are rounded and have a diameter 
of 0'2 mm. The trawl was hauled up just to the ship’s 
side when the line parted ; judging from the extension 
of the accumulator.s, it was apparently heavily laden. 
%), Radiolaria, Lituolidse. 
1 
(I'OO %), m. di. 0'06 mm., a 
few particles have a diameter 
of 0'20 mm., angular; brown 
and red glassy volcanic par- 
ticles, felspar, augite, horn- 
blende, mica, a few grains of 
quartz and pumice. 
(42 '37 %), amorphous matter, 
with many very minute 
mineral particles and a few 
fragments of siliceous organ- 
isms. 
This deposit contains much amorphous clayey matter. 
The trawl brought up the earbone of a ZipJmos, * having 
a very slight coating of manganese ; gi’owing on it was 
a polyp, to which an egg capsule was attached. There 
was also a rounded piece of pumice, 3 to 4 cm. in 
diameter, white coloured and very fibrous, and contain- 
ing small crystals of magnetite and hornblende. 
* See Zool. Chall. Exp., pt. iv, p. 39., pi. ii. fig. 10. 
Olf the Coast of South America between Pernambuco and Bahia — continued. Bahia to Tristan da Cnnlia. 
