3 i 4 DISCOVERY REPORTS 



Station 8. 9. ii. 26. Lat. 42 36' 30 S. Long. 18° 19' 30" W. 3450 m. (Plate XVII.) 

 Globigerina ooze. Light grey, coherent and granular. The larger constituents are mainly shells 



of Globigerina, up to 0-2 mm. in diameter. Finer particles extremely small, chiefly coccoliths, some 



of which occur in groups ; rhabdoliths seem to be scarcer. 



Station 9. 11. ii. 26. Lat. 46 09' S. Long. 22 26' W. 2226 m. (Plate XVII.) 



Globigerina ooze. Brownish, coherent and granular. Coarser material consists of broken 



Globigerina tests, with a few mineral grains. The finer particles consist largely of coccoliths in some 



variety; a few more or less complete coccospheres are noted. 



Station 10. 13. ii. 26. Lat. 46 35' S. Long. 24 15' 30" W. 4402 m. (Plate XVII.) 

 Diatom ooze. A grey-brown, coherent mud. The bulk of the deposit is formed of diatom frustules 

 among which large centric forms (Coscinodiscus) are conspicuous; navicular and elongate forms, 

 including Fragilaria, Achnanthes, Rhizosolenia and Thalassiothrix, are also present. There is much 

 comminuted material, together with some detrital minerals and occasional nasselarian Radiolaria. 

 The presence of the last-named probably accounts for the description of this sample as " radiolarian 

 ooze " in the official Station List, but the deposit is undoubtedly diatom ooze. 



Station 11. 16. ii. 26. Lat. 50 26' S. Long. 30 27' W. 5000 m. (Plate XVII.) 

 Diatom ooze. A grey-brown coherent sediment, becoming light grey on drying. The bulk of the 

 sample consists of the usual diatom assemblage in which frustules of Coscinodiscus, Biddulphia, 

 Achnanthes, Fragilaria, Rhizosolenia and Thalassiothrix are prominent, with a few nasselarian 

 Radiolaria. Some small, angular quartz grains (up to o-i mm. diameter) and fragments of green 

 hornblende are present, but the sample is too small for mineral analysis. 



Station 12. 18. ii. 26. Lat. 51 55' 05" S. Long. n° 44' W. 2744 m. (Plate XVII.) 



Diatom ooze. A grey, powdery sediment containing a variety of diatoms, including Coscinodiscus, 

 Fragilaria, Rhizosolenia, Achnanthes, Thalassiothrix and Biddulphia, with some sponge spicules and 

 small mineral grains. 



Station 13. 3. iii. 26. 57 miles N 49^° E of Jason Light, South Georgia. 143 m. (Plate XIX, 

 inset.) 



Diatomaceous mud. A greenish grey " buttery " clay. The bulk of the deposit consists of mineral 

 grains, usually very small, but quartz grains occasionally reach a diameter of 0-2 mm., and prisms of 

 green hornblende a length of 0-05 mm. Much comminuted diatom material is present as well as 

 recognizable centric and navicular diatoms and sponge spicules. 



Station 14. 3. iii. 26. 15-4 miles N 44J- E of Jason Light, South Georgia. 260 m. (Plate XIX, 

 inset.) 



Diatomaceous mud. The deposit has a "buttery" consistency and is mainly composed of finely 

 comminuted diatom material. Some frustules of Coscinodiscus are large, but most are less than 

 o-i mm. across; tests of Fragilaria and Thalassiothrix, as well as sponge spicules are present. Some 

 rounded quartz grains reach a diameter of 0-2 mm., but the average is below 0-05 mm. Grains of 

 brown hornblende are about 0-05 mm. long. There is apparently no mineral to account for the 

 greenish hue of the mud, which may be due to a vegetable pigment such as chlorophyll. 



Station 15. 3. iii. 26. 25 miles N45|°E of Jason Light, South Georgia. 191m. (Plate XIX, inset.) 



Diatomaceous mud. Similar to samples from Sts. 13 and 14; mineral grains reach 01 mm. in 

 diameter. 



Station 16. 3. iii. 26. 36-5 miles N 46 E of Jason Light, South Georgia. 727 m. (Plate XIX.) 



Diatomaceous mud. The sediment has separated into layers during storage, dark grey below, 

 light brown above. The finer particles are mainly diatoms, Coscinodiscus and Fragilaria being con- 

 spicuous forms; sponge spicules and fragments of Radiolaria are also present. Quartz grains are 

 abundant and large, many being over 01 mm. in diameter; they are angular to subangular in shape. 

 Grains of green and brown hornblende (o-i mm.) and occasional splinters of volcanic glass are noted. 



