378 PERCY SLADEN TEUST EXPEDITION. 



The following table shows the types to which these 20 samples have been referred : — 



12 samples were classed as Globigerina Oozes. 



1 sample was „ Globigerina Ooze or Coral Mud. 



4 samples were „ Coral Muds. 

 3 „ „ „ Pteropod Oozes. 



The Globigerina Oozes were, as in the case of the described samples, widely distributed 

 over the region explored, and came from depths varying from 731 to 2192 fathoms. 

 The deposit which might be called either a Globigerina Ooze or a Coral Mud came 

 from a depth of 692 fathoms, 3 miles south-west of Peros in the Chagos Archipelago. 

 The Pteropod Oozes were all taken in the Chagos Archipelago, at depths of 223, 363, 

 and 575 fathoms, while two of the Coral Muds came from the Salomon group in the 

 Chagos Archipelago, and 2 from the Saya de Malha Bank. 



A. — Samples fully described. 



No. 1. May 16, 1905. 

 Lat. 3° 14' S., Long. 72° 58' E. ; depth, 2078 fathoms. 



GLOBIGERINA OOZE : fawn colour, granular, incoherent, many of the shells macroscopic. 



Calcium Carbonate : 82' 13 per cent., pelagic and bottom-living Foraminifera, Echinoid spines, 



Coccoliths (very small). 

 Kesidue : 17*87 per cent., grey in colour : — 



Siliceous Organisms (1 per cent.) : arenaceous Foraminifera fragments, Radiolaria, Sponge 



spicules, Diatoms. 

 Minerals (1 per cent.) : angular, m. di. 0'06 mm., pumice, volcanic glass. 



Fine Washings (15-87 per cent.) : amorphous clayey matter with minute minerals and splinters 

 of siliceous organisms. 



No. 2. May 16, 1905. 

 Lat. 3° 31' S., Long. 72° 27' E. ; deptb, 2008 fathoms, 



GLOBIGEEINA OOZE : light grey, slightly coherent, chalky. 



Calcium Cakbonate : 60'68 per cent., pelagic and bottom-living Foraminifera, Echinoid spines, 



Ostracodes, Coccoliths, and a very few Rhabdoliths. 

 Residue : 39'32 per cent. : — 



Siliceous Organisms (10 per cent.) : Radiolaria, Sponge spicules, fragments of arenaceous 



Foraminifera, Diatoms. 

 Minerals (trace) : one or two glassy particles observed. 

 Fine Washings (29"32 per cent.) : amorphous clayey matter with siliceous fragments. 



Note. — In this deposit the pelagic Foraminifera are remarkably free from admixture with other 

 calcareous organisms, for beyond the Coccoliths and one or two Rhabdoliths, only one bottom-living 

 form and one Echinoid spine and an Ostracode valve were observed during the examination of a 

 considerable quantity of material. 



