40 BULLETIN OF THE 
Residue, 96.54 per cent, gray, consists of Minerals (80.00), m. di. 0.4 mm., 
fragments of milky and hyaline quartz 1 to 2 mm. in diameter, felspar, horn- 
blende, mica, glauconite, augite, fragments of ancient rocks, and fragments of 
serpentine rocks much decomposed. Siliceous organisms [6.00], Sponge spicules, 
a few Radiolarians and Diatoms. Size washings [10.54], green argillaceous mat- 
ter with glauconitic particles, fine minerals, and fragments of Sponge spicules and 
Diatoms. 
Station 340. — Lat. 39° 25’ 30” N. Long. 70° 58’ 40” W. Depth, 1394 
fathoms. Surf. temp..763°. Bot. temp. 38°. A gray mud, coherent, plastic, 
dries into hard lumps. 
Carbonate of Calcium, 16.81 per cent, consists of coccoliths and coccospheres, 
otoliths of fish, fragments of Deztalium and Echinoderms, and the following 
Foraminifera : — 
Globigerina bulloides, few. Rotalia repanda, rare. 
G. inflata, few. Truncatulina lobatula, few. 
G. dubia, few. Uvigerina pygmea, few. 
G. rubra, few. Bulimina marginata, rare. 
Pulvinulina menardii (dwarfed), rare. Nonionina umbilicatula, rare. 
P. micheliniana, rare. Biloculina ringens (dwarfed), rare. 
P. elegans, rare. 
Residue, 83.19 per cent, dark brown, consists of Mizerals [40.00], m. di. 
0.3 mm., quartz, felspar, mica, hornblende, magnetite, olivine, glauconite, glassy 
fragments. Siliceous organisms [5.00], Diatoms, Radiolarians, and Sponge spi- 
cules. Fine washings [38.19], argillaceous matter, fine mineral particles, and 
fragments of siliceous organisms, 
2. Specimens of deposits procured off the Coast of the United States 
between Cape Hatteras and Lat. 31° 48! N. 
These deposits are green muds or sands.. They are with two. excep- 
tions under 1,000 fathoms, and are mostly under the waters of the Gulf 
Stream, or along: its inner margin. The mineral particles are much 
the same as those in the deposits north of Cape Hatteras, but are all 
very much smaller, and have evidently not been transported by ice. 
The mineral particles, with the exception of the concretions formed at 
the bottom, seldom exceed 0.4 mm. in diameter, and consist of quartz, 
felspars, augite, hornblende, magnetite, and a few fragments of glassy 
rocks. Glauconitic grains and casts are frequently very abundant, as 
are also grains of manganese peroxide. 
The carbonate of lime makes up usually over 50 per cent of the 
whole deposit, and consists chiefly of the dead shells of pelagic Forami- 
nifera, along with shells of pelagic Mollusks, fragments of Echinoderms, 
