OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION, 651 



5 5 per cent, of foraminifera (chiefly cold-water forms — Globigerina injlata, G. dutertrei, 

 and G. pachyderma) along with other more Northern types, but also 30 per cent, 

 of siliceous organisms, chiefly diatoms, although radiolaria are fairly abundant. The 

 position of the Diatom ooze band on this meridian must therefore be shown as in my 

 chart, i.e. shifted northwards from the position in which it is marked in the Challenger 

 map and also in the Valdivia report. The trawl in this situation, on the southern 

 extension of the mid- Atlantic rise discovered by the Scotia, brought up a considerable 

 quantity of rock fragments, almost all under 2 inches in diameter and mostly angular 

 or sub-angular in shape. A few showed glacial striae, one black shaley pebble being 

 particularly well rounded and striated. The rocks were of rather greater variety than 

 those obtained in the Weddell Sea, where granitic and gneissic rocks predominate. 

 They included white quartzite (abundant), granite, diorite, greywacke, shale, slate, one 

 piece hard fireclay, and a few volcanic rocks, chiefly scoriaceous, also some compact 

 basalts. Some of the fragments were clean, but the majority had a black manganese 

 staining on their surface. 



The sample from lat. 41° 30' S., long. 9° 55' W. (No. 49), a little to the south of 

 Gough Island, is a typical G-lobigerina ooze, containing 71 percent. CaCOg with fairly 

 abundant coccoliths and a few rhabdoliths. The foraminifera, however, are all more or 

 less dwarfed forms. 



In the two samples of Globigerina ooze obtained between Gough Island and Cape 

 Town (Nos. 50 and 51) the percentage of lime falls to 46 per cent, and 40 per cent, 

 respectively. The mineral particles here only constitute 1 per cent, of the whole 

 deposit, but the fine washings still show a considerable amount of minute mineral 

 particles, although the proportion of true amorphous clay is much larger, in No. 51 

 being almost sufiicient in quantity to term the deposit a transition to Red clay. A 

 typical area of this deposit is known to be not far ofi", between this point and the 

 Cape of Good Hope. 



Systematic Description of Samples. 



1. Station 81; December 20, 1902; lat. 18° 24' S., long. 37° 58' W., on the 

 Abrolhos Bank ; depth 36 fathoms. 



Hard Ground. — Nothing came up in the sounding-tube. From the dredge, 

 which was very much torn, and from the attached swabs were picked ofi" a number 

 of calcareous organisms, fragments of coral, lamellibranch shells, bryozoa, and 

 foraminifera, 



Foraminifera : — Chief forms : Globigerina rubra, Polytrema miniaceum, Amphi- 

 stegina lesonii ; various others. 



2. Station 118; January 26, 1903; Stanley Harbour, Falkland Islands; depth 

 2^ fathoms. 



