302 
THE VOYAGE OF H.M.S. CHALLENGER. 
of ii greyish colour, perforated by worm tracks, and coated with manganese ; these con- 
cretions contained a few Coccoliths and crystals of phillipsite. 
Stiition 287, 2400 fathoms. — The deposit in the sounding tube was of a dark chocolate 
colour, and contained a considerable amount of manganese, along with crystals of phillip- 
site, palagonitic fragments, and small sharks’ teeth. 
Station 288, 2G00 fathoms. — The sounding tube had sunk 18 inches into the deposit; 
it wjis of a red colour throughout, and contained an immense number of manganese 
particles, zeolitic crystals, and palagonitic fragments. 
Station 289, 2550 fathoms. — The trawl brought up over a busheP of manganese 
nodules, to some of which clay adhered, but at this station no specimen of the deposit 
was obtained, either in the bag of the trawl, in the tow-net attached to the trawl, nor in 
the sounding tube. This, together with the fact that the sounding tube and the iron- 
work of the trawl were scored with manganese, indicates that the nodules must have 
been very abundant. They were nearly all of large size, some being 6 or 7 cm. in 
diameter. Their surfaces were exceedingly irregular, and they easily broke into segments 
following the radii and the concentric layers. The nuclei were generally deeply imbedded, 
there being very few sharks’ teeth or earbones with a slight coating of manganese as at 
Stations 285 and 286, indeed, only two sharks’ teeth were noticed as nuclei of the 
nodules ; there were, however, seven earbones forming nuclei. Some of the nuclei were 
formed of basic volcanic glass and palagonite. The internal concentric layers were, in 
some of the nodules, of a lighter colour than the external ones, as shown in PI. III. fig. 7, 
representing one of the nodules from this station. Another nodule is represented in PI. 
IX. fig. 3 ; the upper portion of the figure shows the manner in which the segments 
break away from the nodule. In the hollows between the rather large mammillae a 
ramifying Rhizopod tube is shown, but on the whole the surfaces of the nodules from this 
station were remarkably free from organisms. 
Station 290, 2250 fathoms. — The outside of the sounding tube was covered with 
black streaks of mangauese ; the leads and ironwork of the trawl were also covered with 
similar streaks, as if they had been rubbing on nodules at the bottom. In the bag of the 
trawl, however, there was only a single small nodule about the size of a marble, to which 
ail cgg-f;apsule was attached. 
Station 292, 1600 fathoms. — The dcpo.sit at this station was a Globigerina Ooze of a 
dark brown colour from the pre.sence of manganese peroxide. Some of the Foraminifera 
shells were covered with black specks of manganese, while numerous grains of manganese 
and .some palagonitic fragments were also observed. 
Station 293, 2025 fathoms. — The deposit was dark brown in colour from the presence 
of nianganc.se grains, and in the bag of the trawl were about a dozen manganese nodules, 
Uj which several organisms were attached. Some of these nodules had nuclei of ba.sic 
' About 38 litres. 
