32 6 DISCOVERY REPORTS 



R.R.S. 'WILLIAM SCORESBY' 



Station WS 18. 26. xi. 26. Lat. 54° 07' S. Long. 36 23' W. 113 m. (Plate XIX.) 

 Diatomaceous mud. A small sample containing much detrital mineral material. Large mineral 

 grains, up to o-i mm. across, are mingled with exceedingly fine sediment. The latter includes com- 

 minuted diatoms and possibly other organic debris. Centric diatoms, some more than o-i mm. in 

 diameter, and sponge spicules are present. 



Station WS 20. 28. xi. 26. Lat. 53 52' 30" S. Long. 36 00' W. 535 m. 



A small sample in a glass tube which is enclosed with a label in a bottle. The label states — " Brought 

 up in a net lowered to 500 m. and hauled to 250, then closed. Lucas Sounder gave 535 m., rock". 



The tube contains a small quantity of sand containing grains up to 0-25 mm. in diameter. There is 

 no muddy material. Some tests of Globigerina occur. 



As this sample is probably incomplete it is not classified with the others in this report and the 

 station is not entered on Plate XIX. 



Station WS 26. 18. xii. 26. Lat. 53 33' 15" S. Long. 37° 45' 15" W. 1180 m. (Plate XIX.) 



Diatomaceous mud. A greenish grey mud ; the preservative liquid has acquired a greenish tinge. 

 This sediment might be classed as diatom ooze except for the presence of green flocculent material 

 and the proportion of mineral grains which reach a diameter of o-i mm., though the majority are 

 below 0-05 mm. Quartz and green hornblende are the only conspicuous minerals. The sample as a 

 whole is extremely fine grained and the diatoms are small. Coscinodiscus, Rhizosolenia and Fragilaria 

 are the chief genera. 



Station WS 28. 19. xii. 26. Lat. 53 48' 15" S. Long. 38 13' W. Two samples from depth of 

 346 and 150 m. respectively. (Plate XIX.) 



Diatomaceous mud. The sample from 346 m. consists of abundant mineral grains (a few up to 

 0-4 mm. diameter) enclosed in a "matrix" of flocculent material. The latter consists of diatoms 

 {Coscinodiscus and Fragilaria), tiny mineral grains and indeterminable debris, some of which appears 

 to be of diatomaceous origin. 



A label in the bottle containing the second sample states, " N 70 V touched bottom at 145 m." The 

 sample is a clean sand with many dark and opaque grains which appear to be rock fragments ; many 

 grains reach a diameter of 0-25 mm. and more. This is probably an incomplete sample, the finer 

 constituents having been lost. 



Station WS 32. 21. xii. 26. Mouth of Drygalski Fjord, South Georgia. 225 m. (Plate XIX.) 



Diatomaceous mud. A grey sediment of the usual diatomaceous character. Fragilaria, Coscino- 

 discus and Thalassiosira are the chief diatoms. The sand grains are small, being less than 005 mm. 

 in diameter. Green hornblende, as well as quartz, is abundantly represented among the grains. 



Station WS 33. 21. xii. 26. Lat. 54 59' S. Long. 35 24' W. 135 m. (Plate XIX.) 

 Diatomaceous mud. A grey mud containing a fair amount of detrital grains, some reaching o- 2 mm. 

 in diameter, many up to o-i mm. Green hornblende is of common occurrence. There is much 

 flocculent material containing diatom frustules (Coscinodiscus, Fragilaria, etc.) and sponge spicules; 

 the masses of this material often show a green colour which is sufficient to give a greenish tinge to the 

 whole sample when wet. 



Station WS 37. 22. xii. 26. Lat. 54 45' S. Long. 35 11' W. 318 m. (Plate XIX.) 

 Diatomaceous mud. A grey mud similar to that from St. WS 33. There are abundant detrital 

 grains, some 0-2 mm. in diameter, among which quartz, felspar and green hornblende are noted. 

 Diatoms are abundant, whole tests are more conspicuous than in the foregoing sample and perhaps 

 in greater variety; centric forms (Coscinodiscus and Thalassiosira) reach a diameter of o-i mm. The 

 flocculent material contains green masses, some of which firmly enwrap sand grains. It may be 

 suggested that the enclosure of detrital grains in the buoyant flocculent material is an important 

 factor in the transport of the mineral grains far from their original source. 



