3 i6 DISCOVERY REPORTS 



of o- 1 mm. ; green hornblende (005 mm.) is also noted. The greenish tinge of the sediment, and the 

 acquisition of a green colour by the preserving liquid is probably caused by the presence of vegetable 

 pigments. 



Station 41. 28. iii. 26. i6J miles N 39° E of Banff Point, South Georgia. 272m. (Plate XIX, inset.) 



Diatomaceotjs mud. A slightly greenish mud, the bulk of which consists of diatom frustules, 

 mostly fragmentary but with some entire frustules of Coscinodiscus, Fragilaria and other forms ; the 

 centric forms are often especially well-developed. Some grains of quartz and green hornblende are 

 noted. A quantity of greenish flocculent material is present. 



Station 42. 1. iv. 26. Off mouth of Cumberland Bay, South Georgia. From 6-3 miles N 89 E 

 to 4 miles N 39 E of Jason Light. 204 m. (Plate XIX, inset.) 



Diatomaceous mud. This sample consists mostly of finely comminuted diatomaceous material. 

 Some of the centric forms are large, but the majority are below o-oi mm. in diameter. The navicular 

 and elongate diatoms are small. Sponge spicules are present. The quartz grains, 0-1-0-05 mm. in 

 diameter, are mainly angular in form. 



Station 48. 3. v. 26. 8-3 miles N 53 E of William Point Beacon, Port William, Falkland Islands. 

 Two samples from 105 m. (shoot) and 115 m. (haul). (Plate XVIII.) 



Shelly sand. Both samples are similar in constitution. They are speckled grey and white sands, 

 consisting mainly of clean white quartz in subangular to rounded grains, with occasional rounded 

 crystals of hypersthene, red garnet, and brown tourmaline. The organic remains include many 

 Foraminifera (Polystomella and other rotalids) up to 1 mm. in diameter, echinid spines (mostly 

 broken and some rolled), a few young gastropods and a quantity of broken molluscan shells. 



Station 51. 4. v. 26. Off Eddystone Rock, East Falkland Island. 7 miles N 50 E, to 7-6 miles 

 N 63 E of Eddystone Rock. 115 m. (Plate XVIII.) 



Fine sand. The bulk of the sand grains are less than 0-5 mm. in diameter but some grains are 

 larger; they are mainly subangular fragments of quartz, with occasional rounded grains of hypers- 

 thene. There are numerous shells and small pebbles, while among the finer constituents are Fora- 

 minifera, echinid spines and shell fragments. 



Station 63. 22. v. 26. Lat. 48 50' S. Long. 53 56' W. Depth not recorded. (Plate XVII.) 

 Diatomaceous mud. The coarser fraction of this greenish mud consists of sand grains up to 

 about o-i mm. in diameter; they are subangular to rounded in shape. The finer material also con- 

 tains some mineral grains (perhaps more angular than the coarser grains), but diatomaceous debris 

 forms the greater bulk. Diatoms are present in variety and include the genera Coscinodiscus, 

 Thalassiosira, Cocconeis, Fragilaria, Thalassiothrix and Rhizosolenia. A considerable proportion of 

 the mud consists of flocculent aggregates formed of disintegrated diatom frustules and their cell 

 contents. 



Station 64. 22. v. 26. Lat. 48 34' S. Long. 53 34' 30" W. 4136 m. (Plate XVII.) 

 Globigerina ooze. The very small sample of sandy deposit contains entire examples of Globi- 

 gerina and rotalines, but also much comminuted material. Many glauconite grains occur, some dark 

 green but the majority show a yellowish green colour. Mineral grains, mostly rounded quartz frag- 

 ments, reach a maximum diameter of 0-5 mm. This is obviously not a typical Globigerina ooze, but 

 a mixed deposit which occurs at the margin of the Globigerina belt. 



Station 71. 30. v. 26. Lat. 43 20' S. Long. 46° 02' W. 5460 m. (Plate XVII.) 



Radiolarian ooze. A brown unctuous mud. A large part of the material consists of extremely 



small particles, which form a flocculent "matrix". Quartz grains are dispersed through the deposit, 



and some reach a diameter of o-i mm. The coarse residue after washing shows plentiful Radiolaria. 



Centric and navicular diatoms are also present. The sample is similar to the deposits from Sts. 74 



and 77 which are discussed in greater detail. 



