1208 
THE VOYAGE OF H.M.S. CHALLENGER. 
SrmoN 326. 
Station 326 (Sounding 476), Rio de la Plata to Tristan da Cunlia (see Chart 16 
and Diagram 6). 
.March 3, 1876 ; lat. 37“ 3' S., long. 44“ 17' W. 
Temperature of air at noon, 67“'8 ; mean for the day, 68“'0. 
Temj)erature of water : — 
Surface, .... 
67-8 
300 fathoms, 
25 fatlioms, 
63-7 
400 
>> 
50 „ ... 
59-0 
500 
75 ,, ... 
55-8 
GOO 
>7 
100 „ ... 
53-3 
700 
77 
125 „ ... 
50-4 
800. 
77 
150 „ ... 
46-1 
900 
77 
175 „ ... 
43-5 
1000 
77 
•200 „ . . . 
42-0 
2125 
77 
225 „ . . . 
41-2 
2325 
77 
250 „ . . . 
40-2 
2525 
77 
275 „ . . . 
39-7 
Bottom, 
39-1 
37-8 
37-1 
370 
37-0 
37-0 
37-0 
37-0 
37-0 
36-2 
330 
32-6 
Density at 60“ F. at surface, 1 ‘02491 ; bottom, 1 ‘02581. 
Depth, 2775 fathoms ; deposit. Blue Mud, containing 3‘11 per cent, of carbonate of 
lime (see Murray and Renard, Deep-Sea Deposits Chall. Exp,). 
At 3 p.M. shortened and furled sails, and proceeded under steam to sound. At 4 p.m. 
sounded in 2775 fathoms. Obtained serial temperatures. The carbonic acid was 
detennined in the surface water, and amounted to 34‘0 milligrammes per litre. At 7 p.m. 
coni}»leted observations and made sail. Diomedea exulans and two kinds of petrels 
were seen from the ship. 
Tri.stan da Cunha distant at noon, 1551 miles. Made good. 78 miles. 
OBOAXI!*M.n rKOM 
Surface- N m. 
Siirface Organisms. — The following species are recorded from the surface at this 
Station : — 
SiPH()Noi>ii()R/K (Iljieckel, Zool. pt. 77). 
Vo4jtm kdllilceri, n.sp. 
Copmn)A (Brady, Zool, [>t, 23). 
Calanus vrdyns, n.sp. 
(JnudfU'p jKu-Injdnctylay Dana. 
Trmnra duhin (Lubbock). 
('cntrojHtffCM inolacr-Hs (Claus). 
l*ont4’Uojmia rdlom, n.g., n.sp. 
(Jort/caruji varius, Dana. 
Oncjpfi ohtuMo (Dana). 
Sajthirina inwyunlis, Dana. 
Amphipoda (Stebbing, Zool. pt. 67). 
Phronimella sp. (?), 
ScHizopoDA (Sars, Zool. pt. 37). 
Thysanoassa gregaria, n.sj). 
Nematosedis rostrata, n.g,, n.sp. 
Siriella thoiivpsoni (M.-Edwards). 
Ptkropoda (Pelsenecr, Zool. pt. 65). 
Clio {Creseis) acicula (Rang). 
