on board H.M.S. ( Challenger' 475 



Sounding 19. 2nd February, 1873. South o£ Bugro Island. 1150 fathoms. 

 A grey mud containing : — Much volcanic sand, as olivinite ; pelagic 

 Foraminifera and Gasteropod, Pteropod, and Heteropod shells, 

 Coccoliths ; a few siliceous spines, but no Eadiolaria were observed. 



Sounding 20. 2nd February, 1873. 930 fathoms. A grey mud con- 

 taining : — Much volcanic sand and many very fine mineral particles j 

 a few pelagic Foraminifera, Pteropods, and surface Gasteropods, a 

 few Coccoliths ; no siliceous remains were observed. 



Sounding 21. 2nd February, 1873. 1500 fathoms. A grey mud con- 

 taining : — Much volcanic sand (red, white, and black particles and 

 olivine) ; a good many pelagic Foraminifera ; Pteropod, surface 

 Gasteropod, and Heteropod shells ; Coccoliths and Ehabdoliths ; a 

 few siliceous spines and Eadiolaria. 



At Canaries. 



Sounding 25. 10th February, 1873. 278 fathoms. A dark grey mud 

 or sand containing : — Many volcanic sandy particles ; a few pelagic 

 Foraminifera, Pteropods, Gasteropods, and Coccoliths ; one or two 

 siliceous spines. 



Soundings 26 and 28. At 630 and 560 fathoms respectively. The same 

 as No. 25. 



Sounding 29. 10th February, 1873. 78 fathoms. A coarse sand formed 

 of debris of volcanic rocks, with pieces of Echinoderms, Foraminifera, 

 molluscous shells, &c. 



Sounding 31. 10th February, 1873. 640 fathoms. Off Teneriffe. A 

 grey mud containing : — Much volcanic sand, black, white, and red in 

 colour, and olivine; some pelagic Foraminifera, Pteropods, pelagic 

 Gasteropods, and Heteropod shells ; a few Coccoliths ; one or two 

 Eadiolaria. 



Sounding 33. 11th February, 1873. 1750 fathoms. A grey mud con- 

 taining : — Very many fine particles of volcanic sand of black, white, 

 and red colour, and amorphous clayey matter ; a good many pelagic 

 Foraminifera and Coccoliths ; one or two Eadiolaria. 



Sounding 36. 12th February, 1873. 620 fathoms. A grey mud con- 

 taining : — Very many particles of volcanic sand and amorphous 

 clayey matter; many pelagic Foraminifera, Pteropods, and other 

 surface shells. 



Sounding 37. 15th February, 1873. 1800 fathoms. Lat. 27° 24' N"., 

 long. 16° 55' W. A grey mud containing : — Many fine particles of 

 volcanic sand of white, black, and red colour ; pelagic Foraminifera, 

 Coccoliths, and Ehabdoliths ; a few Eadiolaria. 



Sounding 38. 17th February, 1873. 1945 fathoms. Lat. 25° 15' N., 

 long. ' 19° 14' W. A Globigerina-ooze containing : — Yery many 



