PLATE XL 
Fig. 1. Section of Globigerina Ooze from Station 176 ; 1450 fathoms, South Pacific. The preparation shows 
numerous sections of shells of pelagic Foraminifera, some of which are filled with an argillaceous 
substance of a darker colour than the surrounding mass ; others, however, are filled with substances 
of a lighter tint. Some of the Foraminifera from this station yield, after treatment with dilute 
hydrochloric acid, external and internal silicated casts (see Plate XXIV. fig. 3). Among the 
mineral particles, colourless splinters of pumice can be recognised. The black particles scattered 
over the figure are peroxide of manganese (magnified 104 diameters). 
Fig. 2. Mineral particles of Blue Mud from Station 237 ; 1875 fathoms. North Pacific. These are almost 
all of volcanic nature : bro-svn scoriaceous lapilli, fragments of palagonite, and numerous elongated 
fibrous splmters of pumice. Colourless crystals of felspar, among which are plagioclases, may be 
recognised ; they contain brown or black and opaque inclusions of glass. Around these crystals 
of felspar there is at some points vitreous matter of the same colour as the inclusions, being the 
remains of the vitreous matter to which these clastic fragments were attached. In addition there 
are fragments of hornblende, with characteristic cleavages, pale green splinters of augite, grains of 
magnetite, minute particles of other volcanic substances, together with amorphous matter and 
organic remains (magnified 37 diameters). 
Fig. 3. The minuter calcareous particles of Globigerina Ooze from Station 166; 275 fathoms. South Pacific. 
Here the Coccoliths and Coccospheres are of a large size, and the Rhabdoliths are relatively 
rare (magnified 500 diameters). 
Fig. 4. The finer portions of Globigerina Ooze from Station 338; 1990 fathoms. South Atlantic, chiefly made 
up of Coccoliths, Rhabdoliths, and the primordial chambers of Globigerinx, together with fragments 
of other calcareous organisms. Coccospheres are not here represented (magnified 500 diameters). 
Fig. 5. General appearance of Globigerina Ooze, as seen by reflected light, after some of the finer amorphous 
particles have been washed away. It consists chiefly of various species of pelagic Foraminifera, 
together with a few fragments of worm-tubes, Pteropods, and Ostracode valves. Station 13; 
1900 fathoms. North Atlantic (magnified 25 diameters). 
Fig. 6. General appearance of Ptcropod Ooze as seen by reflected light, after some of the finer amorphous 
particles have been washed away. It consists principally of Pteropod, Ileteropod, and other Mol- 
luscan shells, together with numerous shells of pelagic Foraminifera. Station 22 ; 450 fathoms. 
North Atlantic (magnified 5 diameters). 
