878 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station 225 . 
ORUA.VI.SM.S PROM 
THE DbPOHIT. 
Depth, 4475 fathoms; deposit, Radiolarian Ooze, containing only a trace of 
carbonate of lime (see INIurray and Renard, Deep-Sea Deposits Chall. Exp,). 
.\t 4 A.M. got up steam. At 5.15 a.m. shortened and furled sails. At 6 a.m. 
proceeded under steam, and sounded in 4575 fathoms. The line was checked at 
4575 fathoms, and the accumulator showed that the weights were off. It must, therefore, 
just have got to the bottom as it was checked. To leave no doubt as to the correctness 
of the .sounding, the line was again let go at 12.30 p.m. with a weight of 4 cwts. 
(instead of 3 cwts, as usual), and the depth obtained amounted to 4475 fathoms, only 
100 fathoms less than the first sounding. In" the first sounding two thermometers and 
water-bottle were attached, but one of the thermometers came up broken. In the second 
sounding two thermometers and the pressure gauge were sent down. Both thermometers 
came up broken, and the pressure gauge was not able to record the pressure existing 
at this great depth, the greatest ascertained during the cruise of the Challenger. At 
3 P.M. took serial temperatures down to 1500 fathoms. The carbonic acid was 
determined in bottom water and amounted to 31 *2 milligrammes per litre. At 4 p.m. 
completed observations and made sail. 
Distance at noon from No Sima lighthouse, 1420 miles. Made good 103 miles. 
Amount of current 19 miles, direction N. 78° W. 
Radiolaria (Haeckel, Zool. pt. 40). — The following is a list of the species of 
Radiolaria observed in the deposit from this Station by Professor Haeckel and Dr. 
Dreyer. They belong almost entirely to the legions Nassellaria and Spumellaria, the 
number of the former to that of the latter being about 2 to 1 ; only two species of 
Phacodaria are noted, while the Acantharia are quite absent ; — 
1. Spumellaria. — Of the Spumellaria the Discoidea are the most abundant, 
being about as numerous as the rest of the Spumellaria together ; after the Discoidea 
come the Sphaeroidea and Prunoidea, and lastly the Larcoidea, which are very sparingly 
rejiresented. 
Ceivjitphara antvjua, Haeckel. 
,, ri-vitala, Ilocckcl. 
„ maxima, Haeckel. 
„ iiidllfif'a, Haeckel. 
CarjMHtpfuera micrococctu>, Haeckel. 
„ nohilu>, Haeckel. 
Cororvuqjhara diadema, Haeckel. 
Ethmotplutra jxjhjnphfmia, Haeckel. 
JAfurjihxra jwlyjtora, Haeckel. 
Mazfuiphjrra ttipjtotin, Haeckel. 
„ lxvi«, J^hrenberg. 
Tr>ji>ano$plixra coronaia, Haeckel. 
T njpanoiplmra tdi'ehraia, Haeckel. 
„ transformata, Haeckel. 
Acroepliara injlata, Haeckel. 
Amphispheera uranus, Haeckel. 
Xiphospliaera juno, Haeckel. 
„ pallas, Haeckel. 
Xiphostyhis alcedo, Haeckel. 
„ edolius, Haeckel. 
„ trogon, Haeckel. 
Caryostylus hexalepaa, Haeckel. 
Staurolojudie straussii, Haeckel. 
Ilexadylus tluxletu, Haeckel. 
