52 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
Fine Washings (95.77 per cent), practically pure flocculent clay. The 
mineral particles present are so small that they cannot be determined ; one 
or two remnants of Sponge spicules. 
No. 18. Station 4683, 9th December, 1904. 
Lat. 20° 2.4'S.; long. 91° 52.5’ W.; depth, 2385 fathoms. 
RED CLAY: the little material available is quite similar to Nos. 16 
and 17. 
CALCIUM CARBONATE: 3 per cent, Pulvinulinide. 
ReEsIDUE: 97 per cent : — 
Siliceous Organisms (traces), a few Sponge spicules. 
Minerals (traces); the most abundant mineral is phillipsite in crystals, 
0.03 to 0.04 mm. in length, and 0.01 mm. in breadth; also a few manga- 
nese grains. The other mineral particles are too small (0.01 mm. in diam- 
eter) to be determined, but still they are probably mostly augite, in angular 
fragments. 
Fine Washings (97 per cent), flocculent reddish-brown clay, with a few 
minute mineral particles. 
No. 19. Station 4685, 10th December, 1904. 
Lat. 21° 36.2’ S.; long. 94° 56’ W.; depth, 2205 fathoms. 
GLOBIGERINA OOZE: dark brown, plastic and sticky, of mottled 
appearance, light yellow patches showing in the dark mass; contains many 
manganese nodules; reddish and coherent when dried; might be called Red 
Clay. 
CALCIUM CARBONATE: 34.07 per cent—mean of two determinations ; 
Foraminifera and a few Fishes’ teeth. 
ResipvuE: 65.93 per cent : — 
Siliceous Organisms (1 per cent), Sponge spicules. 
Minerals (2.5 per cent), angular, mean diameter 0.2 mm., mostly man- 
ganese grains, and next in order of abundance, palagonite, small fragments 
of rocks, magnetite, augite, and volcanic glass. 
Fine Washings (62.43 per cent), brown amorphous clayey matter, con- 
taining a few very small manganese grains and a great number of minute 
crystalline particles. 
