REPORT ON THE DEEP-SEA DEPOSITS. 
73 
Eesidue. 
Additional Obseevations. 
Siliceous Organisms. 
Minerals. 
Fine Washings. 
00 %), Radiolaria, Sponge 
spicules, Lituolidae. 
(I’OO %), m. di. O'OOmm., angu- 
lar ; fragments of felspar, 
glassy volcanic particles, 
augite, hornblende. 
(12'96 %), amorphous matter, 
fine mineral particles, and 
minute fragments of siliceous 
organisms. 
Glassy -volcanic particles are abundant in this deposit, 
many of them pale green or red owing to decomposi- 
tion. Plagioclase, hornblende, and augite fragments 
are rare. The Foraminifera are exceptionally small, and 
Pulvinulina menardii was not observed. 
00 %), Radiolaria, Sponge 
spicules, Astrorhizidse, Lituo- 
lidse. 
(1 '00 %), m. di. 0’06 mm., angu- 
lar ; quartz, felspar, horn- 
blende, mica, volcanic glass. 
(11 '96%), amorphous matter, 
many fine mineral particles, 
fragments of siliceous 
spicules. 
The trawl brought up lanthina, shells occupied by Pag- 
UTUS. The Foraminifera are veiy minute and all the 
typical tropical forms have disappeared. Rounded 
grains of quartz are very rare. 
00 %), a few Radiolaria and 
Sponge spicules, Lituolidae. 
(5 ’00 %), m. di. 0‘06 mm., 
chiefly angular, a few rounded; 
quartz, felspar, hornblende, 
magnetite, black mica, 
pumice, red and brown 
rounded glassy particles. 
(34 ‘82 %), amorphous matter, 
many fine black and other 
mineral particles, and a few 
fragments of siliceous organ- 
isms. 
00 %), a few Radiolaria, 
Lituolidae, Diatoms. 
(SO'OO %), m. di. 0'50 mm., 
angular ; magnetite, augite, 
hornblende, pumice, volcanic 
glass sometimes altered to 
palagonite. 
(12’07 %), many fine mineral 
particles, amorphous matter, 
a few fragments of Radiolaria 
and Diatoms. 
Some of the fragments of volcanic rocks found in this 
deposit have a diameter of from 1 to 3 mm. ; frag- 
ments of felspathic rocks are numerous. Some of the 
shells are macroscopic. 
The dredge brought up a few volcanic rock fragments. 
DO %), Sponge spicules, Litu- 
ilidae. , 
(2 "00 %), m. di. 0'30 mm., an- 
gular and rounded ; sanidine, 
plagioclase, augite, horn- 
blende, black mica, olivine, 
glassy volcanic particles, 
magnetite, lapilli. 
(I’OO %), a small quantity of 
flocculent organic matter, 
minute mineral particles, 
a few fragments of siliceous 
spicules. 
The material brought up by the sounding tube indicated 
a hard shelly bottom. 
There are one or two fragments of basaltic lava from 
3 to 4 cm. in diameter, in which can be distinguished 
crystals of augite and magnetite ; these are surrounded 
by a red zone of decomposition. It may be safely 
said that the bulk of this deposit is made up of Polyzoa. 
Similar in every respect to the above. 
The dredge brought up several large pumice stones. 
(deep-sea deposits chall. exp. — 1890.) 
- 
10 
Bahia to Tristan da Cunha — continued. Oil' Tristan da Cunha. 
