338 DISCOVERY REPORTS 



Station WS 485. 21. xi. 29. Lat. 63 02|' S. Long. 59 17' W. 805 m. (Plate XX.) 

 Diatomaceous mud. This greenish deposit agrees so closely with that from St. WS 484 that the 

 same description applies. 



Station WS 486. 21. xi. 29. Lat. 63 ui' S. Long. 59 13' W. 7S7 m. (Plate XX.) 

 Diatomaceous mud. Closely similar to the foregoing. 



Station WS 487. 22. xi. 29. Lat. 63 17' S. Long. 59° 20' W. 790 m. (Plate XX.) 

 Diatomaceous mud. This also agrees with the last three samples. 



Station WS 488. 22. xi. 29. Lat. 63° 51A' S. Long. 62 31' W. 220 m. (Plate XX.) 

 Terrigenous mud. The character of this deposit is given by its inorganic constituent. The 

 mineral grains range in size from about 0-5 mm. downwards to exceedingly small dimensions. The 

 larger grains are fairly well rounded, but a large proportion of the smaller grains are angular. Apart 

 from quartz, green hornblende seems to be the most abundant mineral ; hypersthene and glaucophane 

 also occur, but the last named only rarely. Organic remains, present only in subordinate quantity, 

 include sponge spicules and diatoms; among the latter Coscinodiscus, Cocconeis, Thalassiosira and 

 Fragilaria are noted. 



Station WS 489. 22. xi. 29. Lat. 63 38' S. Long. 62 32' W. 308 m. (Plate XX.) 

 Diatomaceous mud. This is a greenish grey mud which contains the usual admixture of diatom 

 debris and mineral grains. The latter are mainly angular in shape, and apart from the ubiquitous 

 quartz (up to o-i mm. diameter) include green hornblende (0-05 mm.) and rich blue glaucophane 

 (o-i mm.) in some abundance; the last-named mineral shows the characteristic pleochroism (violet 

 to blue). The diatoms include Coscinodiscus (up to 0-25 mm. across) Thalassiosira, Cocconeis, Fragi- 

 laria, Rhizosolenia. Textularian Foraminifera and sponge spicules are also noted. 



Station WS 490. 22. xi. 29. Lat. 63 24I' S. Long. 62 35 J' W. 262 m. (Plate XX.) 

 Sand. This greyish deposit is best classed as a sand, though it contains a fair quantity of fine- 

 grained flocculent material. The bulk of the sample consists of quartz grains ranging downwards in 

 size from a diameter of about 0-5 mm. Occasional pleochroic prisms of glaucophane (o-i mm. long) 

 and green hornblende (o-2 mm. maximum) are noted and doubtless other minerals are present. 

 Sponge spicules and diatoms occur, but are not sufficiently abundant to give character to the deposit. 



Station WS 493. 23. xi. 29. Lat. 62 51' S. Long. 6o° 34' W. 220 m. (Plate XX.) 

 Sand. This is a dark-coloured sand, with grains from 0-5 to 0-05 mm. in diameter, the average 

 being about 0-25 mm. Most of the grains are brown in colour by transmitted light and isotropic 

 between crossed nicols ; they are sharply angular fragments of glassy and vesicular volcanic material. 

 There is only a small proportion of rounded quartz grains. 



Station WS 494a. 28. xi. 29. Lat. 63 15' S. Long. 6i° 05' W. 1035 m. (Plate XX.) 

 Sand. The character of the detrital material outweighs in importance the organic constituent, and 

 the size of the grains determines the classification of this sample as a sand. The mineral grains include 

 angular and subangular fragments of quartz (up to 0-3 mm. diameter), sharply angular splinters of 

 volcanic glass (up to 0-5 mm.), occasional grains of green hornblende (0-15 mm.) and glaucophane 

 (0-2 mm.). The fine-grained flocculent material encloses frustules of Coscinodiscus, Cocconeis, 

 Franlaria and Rhizosolenia. 



"6* 



Station WS 494b. 28. xi. 29. Lat. 63 37J' S. Long. 6i° 16' W. 505 m. (Plate XX.) 

 Sand. This is a greenish sandy deposit which owes its colour to the fine-grained flocculent con- 

 stituent, which is largely diatomaceous in character. The bulk of the deposit, however, consists of 

 mineral grains up to 0-5 mm. in diameter. Angular and rounded grains of quartz, sharp splinters of 

 volcanic glass, and prismatic grains of green hornblende (0-25 mm. long) are abundant, while occa- 

 sional small grains of glaucophane occur. 



