MUEllAY— DEPOSIT-SAMPLES. 389 



No. 41. August 23, 1905. 

 Lat. 20° 04'-2 S., Long. 57° 27'-2 E. ; depth, 818 fathoms. 



PTEEOPOD OOZE : light fawn, slightly coherent, very fine-grained. 



Calcium Carbonate : 72' 18 per cent., a few pelagic and many bottom-living Foraminifera, Pteropods, 

 Heteropods, larval Gasteropods and Lamellibranchs, Echinoid spines, Coccoliths, a few 

 Rhabdoliths. 

 Residue : 27'82 per cent. : — - 



Siliceous Organisms (5 per cent.) : Sponge spicules, Radiolaria. 



Minerals (5 per cent.) : angular, m. di. 0'09 mm., mainly a decomposed mineral which 

 cannot be determined, but may represent decomposed olivine ; augite, plagioclase 

 (probably belonging to andesine), very little magnetite. 

 Fine Washings (1 7'82 per cent.) : amorphous clayey matter, with minute particles of minerals 

 and siliceous organisms. 



No. 42. August 22, 1905. 

 Lat. 20° 21' 15" S., Long. 57° 18' 20" E. ; depth, 705 fathoms. 

 CORAL MUD : grey, slightly coherent, granular. 



Calcium Carbonate : 77"83 per cent., pelagic and bottom-living Foraminifera, Echinoid shell 

 fragments and spines. Tunicate spicules, Pteropods, Gasteropods, larval Lamellibranchs, 

 fragments of Corals, Polyzoa, Alcyonarian spicules, Ostracodes, and small Coccoliths. 

 Residue : 2217 per cent. : — 



Siliceous Organisms (4 per cent.) : arenaceous Foraminifera, Sponge spicules, Radiolaria. 

 Minerals (2 per cent.) : angular, m. di. 0'08 mm., augite (pale brown), plagioclase, olivine, 

 chloritic mineral, reddish opaque decomposed mineral, magnetite abundant ; flat rounded 

 pebble of basic, igneous rock (10 cm. long, 3 cm. thick). 

 Fine Washings (16"17 per cent.) : amorphous clayey matter, with minute splinters of siliceous 

 organisms and minerals. 



No. 43. 



Oflf Mauritius ; depth, 500-600 fathoms. 



COEAL MUD : brownish-grey, fine-grained, slightly coherent. 



Calcium Carbonate : 56-93 per cent., pelagic and bottom-living Foraminifera, Coral fragments, 



Pteropods, Ostracodes. 

 Residue : 43'07 per cent. : — 



Siliceous Organisms (3 per cent.) : Sponge spicules, clayey casts. 



Minerals (20 per cent.) : most of the particles are Q-l mm. in mean diameter, but many 

 average 1 mm. ; the small ones are angular, the large ones appear rounded : olivine, 

 a little augite, basic plagioclase showing occasionally crystalline contours, much magnetite, 

 decomposed basic minerals. 

 Fine Washings (20-07 per cent.) : amorphous clayey matter, with minute mineral particles 

 and splinters of siliceous organisms. 



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