342 DISCOVERY REPORTS 



Station WS 522. 28. ii-i. iii. 30. Lat. 52° 56' S. Long. 47 14' W. 2550 m. (Plate XVII.) 

 Globigerina ooze. The coarser fraction, which constitutes the bulk of the deposit, has the charac- 

 ters of a Globigerina ooze, with some admixture of terrigenous material. Some sand grains are 

 0-5 mm. in diameter; the minerals represented include angular fragments of quartz and red garnet, 

 and some opaque grains of glauconite with rounded and lobate outlines. There are also a few small 

 pebbles, 1 cm. across. The finer material has a fair proportion of diatom frustules (Coscinodiscus, 

 Fragilaria, Rhizosolenia), with coccoliths and occasional fragments of Radiolaria. A few cross-twins 

 of the mineral phillipsite are noted. 



The main character of the deposit is given by the comparatively large and abundant calcareous 

 organisms, and hence it is classed as Globigerina ooze. 



Station WS 524. 2. iii. 30. Lat. 53 36' S. Long. 43 00' W. 1697 m. (Plate XVII.) 

 Diatomaceous mud. The coarser fraction contains most of the mineral grains, while the finer 

 material is almost entirely composed of diatom frustules. The latter are present in some variety, 

 Coscinodiscus, Arachnoidiscus, Thalassiosira, Fragilaria, Rhizosolenia and Thalassiothrix being the 

 chief genera represented. The mineral grains are subangular to rounded in shape and the great 

 majority are about o-i mm. in diameter; quartz (o-2 mm.), green hornblende and felspar are noted. 

 A few tests of Globigerina also occur in the coarser material. 



Station WS 525. 2. iii. 30. Lat. 53 38J-' S. Long. 41 ° 09' W. 162 m. (Plate XVII.) 

 Gravel (?). The sample consists only of a few small pebbles and grains of quartz. 



Station WS 526. 3. iii. 30. Lat. 53 51' S. Long. 39 45' W. 1545 m. (Plate XVII.) 

 Diatomaceous mud. This greenish mud owes its colour to the presence of green flocculent matter 

 of organic origin ; the preserving liquid has acquired a green tinge. There is a variety of diatom frustules 

 including species of Coscinodiscus, Fragilaria, Biddulphia, Rhizosolenia and Thalassiothrix. A few 

 nasselarian Radiolaria are noted. The coarser fraction consists mainly of subangular quartz grains 

 up to about o-i mm. diameter. 



Station WS 591. 18. v. 31. Lat. 35 47' S. Long. 72 39' W. 27 m. (Plate XXII.) 

 Sand. This is a "Bottom sample from armed lead", consisting of a small quantity of sand, the 

 grains of which average about 0-3 mm. in diameter. The material includes grains of hypersthene 

 (0-3 mm.), besides quartz and opaque grains ; these are mostly angular or only slightly rounded. There 

 is no fine-grained material. 



Station WS 596. 18. v. 31. Lat. 35 35' 36" S. Long. 73 07' 30" W. 369 m. (Plate XXII.) 

 Terrigenous mud. This dark green deposit has layered out during storage. The coarser fraction 

 consists of mineral grains which average about 0-2 mm. in diameter; they are mainly angular frag- 

 ments of quartz, but some are grains of hypersthene and green hornblende. The finer fraction is a 

 flocculent material of rather granular appearance which remains suspended in the green liquid for 

 some considerable time after disturbance. No organisms are recognized except sponge spicules, but 

 the flocculent material generally resembles organic debris; it encloses tiny mineral grains. The 

 detrital mineral constituent gives the main character to the deposit. 



Station WS 597. 19. v. 31. Lat. 35 39' 42" S. Long. 73 19' 30" W. 1593 m. (Plate XXII.) 

 Terrigenous mud. A dark green mud, consisting of somewhat granular flocculent matter, in clots 

 of which small sand grains are embedded. The latter are mostly less than 0-05 mm., but occasionally 

 angular grains of quartz and green hornblende reach a diameter of o-i mm. There is a general 

 paucity of recognizable organic remains but occasional diatoms (Coscinodiscus), rotaline Foraminitera, 

 sphaeroid Radiolaria and sponge spicules are seen. 



Station WS 598. 19. v. 31. Lat. 35 43' S. Long. 73 32' W. 2307 m. (Plate XXII.) 

 Diatomaceous mud. This is a green mud formed of flocculent material enclosing small quartz 

 grains which are generally less than 0-05 mm. in diameter. The organic debris is granular in 



