972 
THE VOYAGE OF H.M.S. CHALLENGER. 
Station 250. 
* I 
Density iit 60° F.: — 
Surface, . 
25 fathoms, 
50 „ 
100 „ 
200 „ 
. 1-02550 
. 1-02537 
. 1-02449 
. 1-02539 
. 1-02542 
300 fathoms, 
400 „ 
2800 „ 
Bottom, 
. 1-02528 
. 1-02531 
. 1-02539 
. 1-02568 
Depth, 3050 fathoms ; deposit, Red Clay, containing only a trace of carbonate of 
lime (see Murray and Renard, Deep-Sea Deposits Chall. Exp.). 
At 4.15 A.M. shortened and furled sails, and proceeded under steam to sound. At 
6 A.M. sounded in 3050 fathoms. Lowered trawl with two tow-nets attached, but hauled 
it in again after 800 fathoms had been paid out, as the weather became unfavourable for 
trawling in great depths. At 7 a.m. took serial temperatures down to 1500 fathoms. 
The carbonic acid was determined in water from 2800 fathoms, and amounted to 
37'4 milligrammes per litre. At 11.20 a.m. completed temperatures, and at 11.30 a.m. 
made sail to a good westerly breeze. 
Honolulu distant at noon, 1096 miles. Made good 115 miles. No current for last 
two days. 
Spence Bate (Zool. pt. 52) records in Benthesicymus jpleocanthus, n.g., n.sp., and 
Gennadas parvus, n.g., n.sp., from this Station ; the specimens probably came from 
Station 205. 
Oboanisji.s non 
THE Depusit. 
The following species of Radiolaria and Diatoms were observed in the deposit from 
this Station (see also Murray and Renard, Deep-Sea Deposits Chall. Exp.) : — 
Radiolaria (Haeckel, Zool. pt. 40). 
Clathrngpheera cirrumtexia, Haeckel. 
Anlhottpyria n/Mthulata, Haeckel. 
Tlu^tjriis proserpina, Haeckel. 
Aulotjraphiit hezaticijstra, Haeckel. 
Aulorerm dirranwder, Haeckel. 
AulonjtcUhu iriodim, Haeckel. 
Challengeron tnangulum, Haeckel. 
Kntocannula circularis, Haeckel. 
Tuscarora tuhulosa, Murray. 
Tuscandium eygneum, Haeckel. 
Concliellium tndacna, Haeckel. 
Conchupsis cornpressa, Haeckel. 
Diatomack/E. — The following species were observed by Mr. Rattray. 
CfMwiiiodiscwi rex, Wallich. 
„ rentralU, Ehrenbcrg. 
„ exeenirirtu, Ehr<;nber^. 
„ manjinaiw, Ehrenberg. 
,, eurratuluM, Grunow, vur. genuitia, 
Grunow. 
,, imperaior, .TanuH-h, an gazellm, Joninch. 
„ anrjiuieAineatwi, A. Schmidt. 
Coscinodiscvs Uneatus, Ehrenberg. 
„ „ forma major. 
„ ra/liatm, Ehrenberg. 
„ „ var. media, Grunow. 
„ argm, Ehrenberg. 
„ polyacanthvs, Grunow. 
Aderolamjna marylandica, Ehrenberg. 
Asteromphalus sJuvlboltianus, Ralfs. 
