3 22 DISCOVERY REPORTS 



fragments is difficult. Occasionally larger grains (o-i mm. diameter) of quartz and volcanic glass 

 are seen. 



Station 194. 28. iii. 27. Lat. 62 57' 30" S. Long. 6o° 22' W., z\ miles east of Deception Island, 

 South Shetlands. 812 m. (Plate XX.) 



Diatomaceous mud. A brownish grey mud containing numerous mineral grains, some of which 

 reach a diameter of 0-5 mm., though the average size is much less. The largest are fragments of brown 

 volcanic glass (0-5 mm.), but angular and subangular grains of quartz and green hornblende are 

 also noted. Organic remains are not conspicuous, though frustules of Coscinodiscus and Fragilaria, 

 together with sponge spicules, do occur. The amount of flocculent material is subordinate. 



Station 195. 30. iii. 27. Lat. 62 07' S. Long. 58 28' 30" W. Admiralty Bay, King George 

 Island, South Shetlands. 391 m. (Plate XX.) 



Sand. This sample is a non-graded sand, of which the largest grains have a diameter of about 

 0-25 mm. ; they are chiefly rounded and subangular grains of quartz, felspar and green hornblende. 

 The only muddy material has formed a coherent film on the surface in the jar ; it shows the same 

 abundance of detrital minerals in smaller fragments. Organic remains are scarce and comprise a 

 few sponge spicules and some small diatom frustules (Coscinodiscus and Fragilaria). 



Station 196. 3. iv. 27. Lat. 62 17' 30" S. Long. 58° 21' W. Bransfield Strait, South Shetlands. 

 Two samples from depths of 720 and ion m. respectively. (Plate XX.) 



Terrigenous mud. Both samples are brownish grey muds, consisting of homogeneous flocculent 

 material in which small mineral grains are embedded. Occasionally, larger grains (0-2 mm.) of 

 quartz and green hornblende are seen. A few diatoms {Coscinodiscus, Fragilaria and Rhizosolenia) 

 and sponge spicules are the only organic forms recognized. 



Station 197. 3.^.27. Lat. 62 27' S. Long. 58 11' 30" W. Bransfield Strait, South Shetlands. 

 1974 m. (Plate XX.) 



Diatomaceous mud. A brownish grey mud of homogeneous constitution. It consists mainly of 

 flocculent organic debris, some flocks having a greenish tinge. Diatom fragments form the bulk of 

 the material, together with unbroken frustules of Thalassiosira, Coscinodiscus, Fragilaria, Rhizosolenia 

 and Corethron. Some of these diatoms retain their protoplasmic content. One textularian Fora- 

 minifer is noted together with the usual sponge spicules. Mineral grains, quartz and green horn- 

 blende, occur in small quantity ; they are mostly less than 0-05 mm. in diameter, and few reach 

 o-i mm. 



Station 198. 3-4. iv. 27. Lat. 62 38' S. Long. 58° 04' W. Bransfield Strait, South Shetlands. 

 1600 m. (Plate XX.) 



Diatomaceous mud. A brownish grey mud similar to that from St. 197. It shows the same 

 characters under the microscope, but no Foraminifera were seen. 



Station 199. 4. iv. 27. Lat. 62 49' S. Long. 57 56' 30" W. Bransfield Strait, South Shetlands. 

 735 m. (Plate XX.) 



Diatomaceous mud. This sample of brownish mud contains one pebble roughly 1 cm. in dia- 

 meter ; it is more sandy than the preceding sample and does not coagulate on drying. The average 

 size of the abundant quartz grains is larger than in samples at Sts. 197 and 198, the maximum dia- 

 meter being about 0-2 mm. Green hornblende occurs also. Centric diatoms, Coscinodiscus and 

 Thalassiosira, are plentiful and reach o- 1 mm. across ; the smaller forms include Cocconeis, Fragilaria. 

 Sponge spicules are noted. Flocculent material of the usual character forms a "matrix", in which 

 the diatoms and mineral grains are enclosed. 



Station 200. 4. iv. 27. Lat. 69 59' 30" S. Long. 57 49' W. Bransfield Strait, South Shetlands. 

 345 m. (Plate XX.) 



Diatomaceous mud. A very small sample of brownish mud, which differs from the preceding in 

 size of the mineral grains and the slight degree of rounding. Quartz grains reach a diameter of 



