MUEEAY — DEPOSIT-SAMPLES. 37T 



2 from near Seychelles at 1462 and 2032 fathoms, 1 from Saya de Malha at a depth of 

 512 fathoms, and 1 from the lagoon of Diego Garcia. 



The following table shows the distribution in depth of the described samples and the 

 types to which they are referred : — 



]9 samples from less thaa 1000 fathoms. 



9 „ „ between 1000 and 2000 fathoms. 



17 „ „ over 2000 fathoms. 



45 



40 samples are Globigerina Oozes. 

 4 ,, „ Coral Muds. 

 1 sample is Pteropod Ooze. 



45 



The Globigerina Oozes come from depths varying from 512 to 2438 fathoms and are 

 distributed throughout the region explored. One sample from the Chagos Archipelago, 

 11 miles north-west of Peros, depth 1746 fathoms, might almost equally well be called 

 Coral Mud ; the size and abundance of the Coral fragments in this sample are 

 remarkable from such a depth so far from the reef. 



Of the Coral Muds, one comes from the anchorage at Takamaka, in the lagoon of 

 Salomon Atoll, one from the anchorage in the lagoon of Diego Garcia, and two from 

 off Mauritius in 500 and 705 fathoms. The Pteropod Ooze was taken off Mauritius at a 

 depth of 818 fathoms. 



The percentage of calcium carbonate is very high (over 50 per cent.) in all the 

 samples. In the majority the percentage varies from 70 to 80 per cent., two contain 

 over 90 per cent., and two less than 60 per cent. 



It may be noted that while Coccoliths are numerous in nearly every sample, 

 Pihabdoliths are very rare, for even in those samples where they were detected only one 

 or two undoubted specimens could be recognised after prolonged search. 



Hed Clay and Radiolarian Ooze are not represented in the series, though in many of 

 the samples Hadiolaria were conspicuous after removal of the calcium carbonate. 

 Diatoms also were observed in nearly every sample, though never in any very great 

 abundance. 



Of the 34 samples not fully described, 14 were inadequate for the purpose of 

 identifying the type of deposit in situ, while 20 samples were looked upon as sufficient 

 to indicate the probable type of deposit. 



Of these 20 samples, 7 came from the open ocean in depths of 1507, 1685, 1858, 1938, 

 2129, 2188, and 2192 fathoms, 9 from the Chagos Archipelago in depths ranging from 

 223 to 944 fathoms, 2 from near the Seychelles in 1195 and 1615 fathoms, and 2 from 

 Saya de Malha in depths of 40 and 47 fathoms respectively. 



