9(56 
THE VOYAGE OF H.M.S. CHALLENGER. 
8T.UION 246. abundant at the surface. It has a very long tail and spines, and has been described by 
Dohrn under the name of Archizoea (his Archizoea gigas is a larger form found in the 
.\utarctic and on the coast of Chili). These nauplii are more like those of a Lepadid 
than of a Balanid, and as Lepas fascicularis has been floating on the surface in 
quantities lately it is probable they belong to that species.” 
Station 247. Station 247 (Sounding 389), Yokohama to Sandwich Islands (see Chart 36, and 
Diagrams 17 and 18). 
July 3, 1875 ; lat. 35° 48' N., long. 179 57' W. 
Temperature of air at noon, 72° ‘3 ; mean for the day, 7l°’3. 
Temperature of water : — 
Surface, . . . . 73'0 
25 fathoms, . . . 63 ’8 
50 „ ... 58-4 
75 „ ... 56-0 
100 „ . . . 54-8 
125 „ ... .54-1 
150 „ . . . 53-5 
175 „ . . . 52-5 
200 „ . . . 50-5 
225 „ . . 48-7 
250 „ . . . 46-0 
275 „ . . . 45-0 
300 „ ... 435 
400 fathoms, . . . 40’7 
500 „ . . . 39-1 
600 „ . . . 38-2 
700 „ . . . 37-7 
800 „ . . . 37-2 
900 „ . . . 36-9 
1000 „ ... 36-6 
1100 „ . . . 36-2 
1200 „ ... 35-9 
1300 „ . . . 35-6 
1400 „ . . . 35-3 
1500 „ ... 35-2 
Bottom, . . . 35’2 
Demsity at 60° F. at surface, r02574 ; bottom, 1 '02568. 
Depth, 2530 fathoms ; deposit. Red Clay, containing 10'06 per cent, of carbonate 
of lime (see Murray and Renard, Deep-Sea Deposits Chalk Exp.). 
I’lider steam all forenoon. At 2.20 p.m. stopped and sounded in 2530 fathoms. The 
upi>cr part of the sounding-tube contained a dark red-coloured clay, about an inch in 
thickness, which did not effervesce with dilute acid, while the lower part was much 
lighter in colour, effervesced with acid, contained many Glohigerinse, Coccoliths, Echini 
spines, as well as Diatoms and Riidiolaria. The line between the two layers was very 
sharjJy marked off by the colour, and judging from our experience in the North Pacific 
the decjier layer would appear to have been formed in a depth of about 2200 fathoms, 
so that there are indications here of a probable subsidence of the sea- floor. At 1 P.M. 
obuined serial temperatures down to 1500 fathoms. The carbonic acid was determined 
in the bottom water, and amounted to 38'2 milligrammes per litre. At 3 p.m. completed 
