OCEANOGRAPHY OF THE PACIFIC. 21 



Station 6II1. — 3,230 fathoniH. Red clay. No organic remains. Sed- 

 iment of decomposing- pumice and minute irregular fragments of per- 

 fectly transparent rock. 



Station 616. — 3,178 fathoms. Red clay. No organisms. Fine min- 

 eral fragments and occasional minute manganese nodules. 



Station 637. — 2,352 fathoms. Volcanic mud. Gray, granular non- 

 coherent mud. \'ery little fine washings. Washed sediment contains 

 a small proportion of foraminifera, arenaceous {Jaculella) and creta- 

 ceous, very many manganese nodules, volcanic glass, and other 

 minerals not identified. 



Station 6If3. — 1,757 fathoms. Globigerina ooze. Brownish-gray. 

 But little amorphous matter. Sediment mostly the usual pelagic forms 

 of foraminifera, and fine, glass}^ mineral fragments. After action of 

 acid there remain large numbers of white silicious casts of foraminif- 

 era, often quite perfect, even of the minute foramina of the shells. 



• Station 61/7. — 605 fathoms. Globigerina ooze. Mostly pelagic 

 foraminifera, with fine coral sand. 



(C) GUAM TO LUZON. 



.Station 663. — 457 fathoms. Coral sand. Blue-black (probably from 

 chemical changes since collection). Contains shells of small univalve 

 and bivalve mollusks, fragments of coral, foraminifera {PulimiiiUna, 

 Cristellaria,, Cassidulina, Miliolina, Nonionina^ Amphistegina., 

 Lagend).^ manganese nodules, and much fine mineral sand. 



Station 670. — 1,376 fathoms. Volcanic mud. Yellowish-brown to 

 black, very irregular fragments of transparent or translucent volcanic 

 glass. The fragments have a resinoid luster, are porous, sharpl}^ 

 angular, often fibrous, as if drawn out when in a semifluid state. A 

 few foraminifera. 



Station 67 Jf. — 1,946 fathoms. Volcanic mud. Very pale yellowish- 

 brown. Sediment consists of a few foraminifera and radiolaria, and 

 a large proportion of minute splinters of volcanic glass. Many parti- 

 cles of palagonite. 



Station 688. — 1,346 fathoms. Globigerina ooze. Contains a very 

 large number of manganese nodules. 



Station 705. — 2,710 fathoms. Red clay. No foraminifera; a few 

 radiolaria and manganese nodules. Volcanic ashes. 



Station 715. — 2,639 fathoms. Red clay. Many manganese concre- 

 tions coating fragments of volcanic minerals. 



Station 7'2'2. — 2,476 fathoms. Red clay. A chocolate -colored, very 

 stick}^ mud. No organic remains. Granular coatings of manganese 

 upon fragments of pumice and lumps of clay. Volcanic ashes. 



Station 730. — 2,761 fathoms. Red clay. Pale yellowish-brown, 

 very fine mud. Rarel}^ a radiolarian or diatom. Mineral matter 

 small in quantity and minute in size 



