J. Murray on Sea-bottom Deposits. 263 
_ It is, however, only in some limited areas that these exuvie 
rise into such prominence as to be characteristic of the deposit 
taking place. Such is the case in the Antarctic, where we 
have a Diatom-ooze, and in the Western and Middle Pacific, 
where we have the above deposit. 
Our deepest sounding (4475 fathoms or 4575) was a Radiola- 
ran ooze; with the exception of a little amorphous matter, 
manganese particles, a few yellow cherty-like particles, and 
some pumice pieces, this bottom was entirely composed of the 
exuvie of organisms with siliceous skeletons—as Radiolaria, 
one or two Diatoms, and some organisms which seem to be 
undescribed (Challengerias), but which are numerous in the 
deeper waters of the Pacific. 
A section of about three inches came up. The upper two were 
of a red color, due to the presence of much manganese; the 
lower one was of a pale straw-color, and contained relatively 
few manganese grains. 
In our trip from the Sandwich Islands to the Society Islands 
We again met with Radiolarian ooze. Between 7° and 12° 
fms. fms. fms. fms. 
) 4575 2700 2250 2350 
i 4475 2900 2600 2750 
2750 
