REPORT ON THE DEEP-SEA DEPOSITS. 
105 
RSSIDUG. 
Additional Observations. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
I'OO %), a few Sponge spicules, 
1 fragments of Kadiolaria, 
Astrorhizidre, Lituolid®. 
i 
(20'00 %), m. di. O'lO mm., 
angular ; sanidine, plagioclase, 
quartz, augite, hornblende, 
magnetite, pumice. 
(43 '66 %), amorphous matter, 
minute fragments of minerals. 
Besides a quantity of the deposit there were in the trawl 
many animals and numerous fragments of trachytic 
tufa. These fragments are generally very compact and 
break up with difficulty, their cohesion being nearly as 
perfect as that of crystalline rocks. They contain | 
Globigerina and other Foraminifera, and a great 
number of volcanic particles, as felspar, plagioclase, 
augite, rarely hornblende, magnetite, fragments of 
volcanic glass. These concretions are true submarine 
tufas, and seem to be an augite-andesitic ash or to 
come from the disintegration of an augite-andesitic 
rock containing hornblende. Vitreous fragments are 
not frequent ; probably they are altered into chloritic 
matter present in the concretions. 
I'OO %), many Eadiolaria, 
siliceous spicules, Lituolid®. 
i 
(5‘00 %), m. di. 0'08 mm., 
angular ; plagioclase, augite, 
volcanic glass splinters, frag- 
ments of altered volcanic 
rocks, magnetite. 
(92'00 %), much fine amorphous 
matter, minute mineral par- 
ticles, and remains of siliceous 
organisms. 
There was one piece of pumice about the size of a pea in 
the sounding tube. In the trawl were a few fragments 
of pumice, about the size of a hen’s egg or less. These 
all contain porphyritic minerals. Inside one piece was 
found an OrbuUna-Ws.& body, having the shell composed 
of black and red particles, but containing no carbonate 
of lime {Placopsilina bulla?). The pumice fragments 
are slightly impregnated in some cases with manganese. 
00 %), Sponge spicules, Radio- 
laria, lihizammina algseformis, 
Lituolid®. 
(I'OO %), m. di. 0'06 mm., an- 
gular ; pumice, felspar, plagio- 
clase, augite, magnetite. 
(48 '97 %), much red amorphous 
matter, fine mineral and 
siliceous remains. 
PulvinuUna favus was noticed here for the first time 
since leaving the Philippine Islands. 
•00 %), Sponge spicules, Radio- 
laria. Diatoms. 
(1'00%), m. di. 0'06 mm., an- 
gular; felspar, pyroxene or am- 
phibole, magnetite, pumice, 
altered volcanic glass. 
(63 '33 %), much amorphous 
matter of a red-brown colour, 
fine mineral particles, and 
remains of siliceous organ- 
isms. 
There are fewer Coccoliths and Rhabdoliths than in the 
previous sounding. There were one or two pieces of 
pumice stone in the sounding tube. A considerable 
number of pumice stones came up in the trawl, varying 
from the size of a marble to that of a good-sized egg. 
The surface of most of these was impregnated with 
manganese. Stephanoscyphus simplex with its stolons 
ran over these stones in gi'eat numbers. There were 
also present in the trawl quantities of RMzammina 
algseformis, the tube of which is composed of Foramini- 
fera and other bottom-living organisms cemented 
together. There were also many worm tubes and a 
large irregular Rhizopod similar in form to (but not) 
Syringammina fragilissima. 
I’OO %), Radiolaria, Sponge 
spicules,' Ehizammina algse,- 
formis, Lituolid®. 
(1'00%), m. di. 0'06 mm., an- 
gular ; felspar, augite, vol- 
canic glass, sometimes altered 
to palagonite, quartz. 
(85 '25 %), much amorphous 
matter, fine mineral particles, 
and remains of siliceous or- 
ganisms. 
There were two or three small pieces of pumice and ' 
several worm tubes or portions of them in the sound- | 
ing tube. 
I'OO %), Sponge spicules, Radio- 
laria, Haplophragmmm agg- 
lutinans, Textularia sagittula. 
Diatoms. 
(20'00 %), m. di. 0'07 mm., 
rounded ; felspar, volcanic 
glass, quartz, magnetite, oli- 
vine, hornblende, mica, pala- 
gonite, glauconite. 
(49 '09 %), fine mineral particles, 
amorphous matter, and silice- 
ous remains. 
A few green casts of the Foraminifera remain after treat- 
ment with acid. 
(deep-sea deposits ohalI'. exp. — 1890.) 
■ 
14 
Samboaiigan to New Guinea — continued. 
