OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 669 



Glacial Clay. — A greyish-brown tough clay requiring a great deal of rubbing 

 down. Almost no grittiness. 



CaCO^ .-—Nil. 



Siliceous organisms, trace : — Sponge spicules. 



Minerals 3 per cent., angular, m. di. 0"08 mm. : — Quartz (clear and limonite- 

 coated), magnetite, volcanic glass and pumice, red palagonite, augite, felspar, green 

 hornblende, mica. 



Fine washings 97 per cent., : — A much larger proportion of amorphous clay than in 

 any other specimen obtained. It approximates really closely to a Red clay in this 

 respect. The minute mineral particles in the fine washings are correspondingly 

 diminished in amount; those that are present are mostly under O'OOo mm. in size, 

 there being few between that and 0'05 mm. 



45. Station 438; April 3, 1904; lat. 56° 58' S., long. 10° 03' W. ; depth 

 2518 fathoms. 



Diatom Ooze or Volcanic Sand. — Of a light straw colour speckled with black. No 

 odour. Very little cohesion, but numerous gritty particles. Readily breaks down in 

 water, and can be separated into two portions, one faintly yellow straw-coloured, com- 

 posed almost entirely of diatoms ; the other dark, almost black, of mineral particles, 



CaCOg.-— Nil. 



Siliceous organisms 55 per cent. : — Diatoms and radiolaria. 



Minerals 40 per cent., angular, m. di. O'll mm. : — Volcanic glass and pumice, red 

 palagonite, augite, magnetite, felspar, a little quartz, biotite, and hornblende. A few 

 large fragments of pumice. 



Fine washings 5 per cent. : — Fragments of diatoms and minute mineral particles. 



Foraminifera : — Cyclammina pusilla, rare. 



46. Station 447; April 9, 1904; lat. 51° 07' S., long. 9° 31' W. ; depth 

 2103 fathoms. 



Diatom Ooze. — No deposit in the sounding-tube, which seemed to have been on 

 hard ground. A few balls of ooze were obtained from the trawl. These were of a light 

 straw colour when wet, almost pure white when dry. Very little cohesion, soft floury 

 feel, almost no grit. Possibly slightly washed or sorted out in coming up, so that it 

 may not be really quite typical of the deposit in situ. 



CaCO^ 9 per cent, (anal.) : — Foraminifera, echinoid spines, a few ostracod valves. 



Siliceous organisms 80 per cent. : — Diatoms chiefly, also radiolaria and sponge 

 spicules. 



Minerals 5 per cent., m. di. 0"15 mm. — Rounded and sub-angular quartz grains, and 

 a few pieces of volcanic glass. 



Fine ivashings 6 per cent : — Fragments of siliceous organisms. 



Chief foraminifera : — Arenaceous types represented by nine genera, the most 



TRANS. ROY. SCO. EDIK, VOL. XLIX. PART III. (NO. 10). 89 



