PRELIMINARY REPORT. 105 
are mine). At Station 259, in 2225 fathoms, 133 miles from Oahu, the 
tow-nets were sent down to 1000 fathoms, but it does not seem to me 
from the lists of the organisms brought up that they include any types 
not found near or at the surface elsewhere in less than 250 fathoms, and 
they were probably obtained in the upper belts. 
The surface organisms of the line Hawaii to Tahiti are marked by the 
large number of species of surface Radiolarians collected specially at Sta- 
tions 270, 271, in the line of the equatorial belt, and immediately north and 
south of it at Stations 268, lat. 7° 35’ N., 269, and 272-274, lat. 7° 25'S. 
At Station 268 there were collected nearly sixty species of Radiolarians 
from the surface; at Station 269 about fifty species; at Station 270 the 
number of species of pelagic Radiolarians had increased to over eighty ; 
and at Station 271 no less than 400 species of Radiolarians are re- 
corded from the surface. At Station 272 the surface Radiolarians had 
decreased to about 120 species; at Station 273 to about seventy-five spe- 
cies; and at Station 274 the species had increased again to about 120 in 
number; and at Station 284, south of Tahiti, in nearly 30° south latitude, 
not more than seven species of Radiolarians were collected at the surface, 
about the same number which were collected at the surface at Station 
262, in latitude 20° N., near Hawaii. At Station 263, lat. 17° 33° N., long. 
153° 36’ W., the surface Radiolarians had increased in number to nearly 
twenty species; at Station 265, lat. 12° 42’ N., long. 152° 01’ W., to nearly 
forty species, and at Station 267, lat. 9° 28’ N., long. 150° 49’ W., to fifty, 
the number of species gradually increasing towards the equatorial current 
belt. 
As regards the other surface animals noted by the “Challenger,” 
they consisted of Diatoms, Pyrocystis, Noctiluca, Globigerine, Orbuline, 
Pulvinuline, Diphyes, and other Medusx, Siphonophores, Sagitta, Echi- 
noderm larvee, and Zoéa, near the Hawaiian Islands ; Euphausia, Sergestes, 
Saphirina, Copepods, Amphipods, Phronimids, Hyperids, Oxyrhynchus, 
Pteropods, Appendicularix, Alciopa, Annelids and their larvee, Tomopteris, 
Salpx, Ianthine, young fishes, Sternoptyx, Scopelids, Cephalopods, Cteno- 
phoree, Halobates, Coccospheres, Rhabdospheres, Ostracods, Hyalea, Spirialis, 
Styliola, Tiedemannia, Stomatopods, Schizopods, Carinaria, Firoloides. These 
