on board H.M.S. 'Challenger.' 497 



tabu. A coral-mud containing : — Some amorphous calcareous 

 matter ; debris of coral reefs ; immense numbers of Orbitolites, and 

 a few other shore forms of Foraminifera, Pteropods, &c. 



22nd July, 1874. 240 fathoms. Outside the reef, Tongatabu. A 

 coral-mud containing : — Much amorphous calcareous matter ; debris 

 of coral reefs ; pelagic and other ForartLinifera, &c. 



24th July, 1874. 315 fathoms. Off Matuka Island, Fiji Islands. A 

 coral-mud containing: — Much amorphous calcareous matter; debris 

 of coral ; pelagic Foraininifera, Pteropods, Heteropods, and other 

 surface shells and shore forms of Foraminifera ; a few black mineral 

 particles. 



Off Kandavu, Fiji Islands. 3rd August, 1874. 140 fathoms. Inside 

 the reef. A coral-mud containing: — Much amorphous calcareous 

 matter; shore forms of Forarninifera, Pteropods, spicules of 

 sponges, &c. ; a few green and red mineral particles. 



3rd August, 1874. 255 and 210 fathoms. Outside the reef, Kandavu. 



A coral-mud containing : — Much amorphous calcareous matter ; 



debris of coral ; Pteropods, Heteropods, and surface Gasteropocls ; 



pelagic and other Foraminifera, Coccoliths, and Ehabdoliths ; a few 



sponge-spicules ; a few green and red mineral particles. 

 A few internal casts of the Foraminifera and Pteropods remained after 

 treatment with acid. 



Sounding 209. 3rd August, 1874. 610 fathoms. A coral-mud con- 

 taining : — Amorphous calcareous and some red clayey matter ; 

 many Pteropod, Heteropod, larval Gasteropod, and Lamellibranch 

 shells; pelagic Foraminifera, Coccoliths, and Ehabdoliths; a few 

 red and white mineral particles and rather large pieces of pumice. 



Sounding 210. 12th August, 1874. 1350 fathoms. Lat. 19° 2' S., 

 long. 177° 10' E. A Globigerina-ooze of a red colour containing : — 

 Some amorphous calcareous and clayey matter ; very many pelagic 

 Foraminifera, Coccoliths, and Ehabdoliths ; very small mineral 

 particles, as pumice; a black scoria-like mineral and manganese 

 grains ; one or two broken pieces of siliceous spines. 

 The trawl brought up many pieces of pumice, some having a slight 



coating of peroxide of manganese. 



Sounding 211. 15th August, 1874. 1450 fathoms. Lat. 18° 30' S., 



long. 173° 52' E. A Glohigerina-oozQ of a red colour containing : — 



Some amorphous calcareous and clayey matter ; very many pelagic 



Foraminifera, Coccoliths, and Ehabdoliths; a good many small 



• pieces of pumice and black and red mineral particles, and some 



manganese grains. 

 Many very complete casts of the Foraminifera, of a red colour, 



remained after treatment with acid. In many cases the red substance 



2o2 



