THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 651 
No. 15. Station 4676, 5th December, 1904. 
Lat. 14° 28.9'S.; long. 81° 24’ W.; depth, 2714 fathoms. 
RED CLAY: brown, plastic and sticky, drying into hard, gray lumps 
with a reddish tinge. 
CALCIUM CARBONATE: (0) per cent. 
ResipuE: 100 per cent : — 
Siliceous Organisms (traces), a few Sponge spicules and Diatoms. 
Minerals (traces), one or two minute manganese grains, and mineral 
particles too small to be determined. 
Fine Washings (nearly 100 per cent), brown flocculent clay, with very 
few minute mineral particles and remnants of Sponge spicules. 
No. 16. Station 4679, 7th December, 1904. 
Lat. 17° 26.4’ S.; long. 86° 46.5’ W.; depth, 2485 fathoms. 
RED CLAY: typical, light-brown clay, very plastic and sticky, drying into 
hard lumps, reddish in hue. 
CALCIUM CARBONATE: 0 per cent. 
Resrpve: 100 per cent : — 
Stdiceous Organisms (traces), a few Sponge spicules only. 
Minerals (traces) ; most of the particles are so small (0.005 mm. in diam- 
eter) that they cannot be determined. One large crystal of felspar, with 
perfect prismatic faces, was observed, and also a few small manganese grains. 
An elongated fragment of pumice, one inch long, is the only macroscopic 
element present. ; 
Fine Washings (nearly 100 per cent), amorphous, light-brown clayey 
matter, with many very minute mineral particles. 
No. 17. Station 4681, 8th December, 1904. 
Lat. 18° 47.1'S.; long. 89° 26’ W.; depth, 2395 fathoms. . 
RED CLAY: typical, light brown clay, very plastic, forming extremely 
hard lumps when dried; shining brown streak. 
CALCIUM CARBONATE: 4.23 per cent, Foraminifera belonging to the 
genus Pulvinulina, and Fishes’ teeth. 
ResipuE: 95.77 per cent: — 
Siliceous Organisms (traces), Sponge spicules. 
Minerals (traces), a few irregular manganese grains, and angular frag- 
ments of felspar, 0.2 mm. in diameter. 
