508 Mr. J. Murray on Oceanic Deposits examined 



largest (2x3x3 inches) contained in the centre a large shark's tooth 

 with serrated edges ; the tooth was well preserved and was about \\ inch 

 in length. Other nodules had smaller teeth, but the majority had a 

 nucleus of pumice. 



Sounding 274. 14th July, 1875. 3125 fathoms. Lat. 38° 9' N., long. 

 156° 25' W. A red clay containing : — Much amorphous clayey 

 matter ; very many fine mineral particles (pumice) ; a great many 

 Eadiolaria and manganese grains. 

 The dredge brought up several nodules and pumicestones. One large 

 nodule or concretion of manganese was 12 x 8 x 2 inches, and had a 

 nucleus of clay and hard cherty-like mineral matter ; its upper surface 

 was smooth and had one Nodosaria and several small pieces of pumice 

 cemented to it by layers of manganese. Attached to its surface and 

 living were — reticulated Ehozopod tubes, Serpula and other worm- 

 tubes, Polyzoa, &c. Its inner surface was rough and uneven, and had a 

 worm-tube attached to one edge. 



fathoms. , , 



3025. Lat. 35 13 N., long. 154 43 W. 

 2850. „ 32 30N., „ 154 38 W. 

 2950. „ 30 22N., „ 154 56 W. 

 2875. „ 2733N., „ 154 55 W. 

 2775. „ 26 5N., „ 155 8¥. 

 In. each case a red clay containing: — Much amorphous clayey matter; 

 many fine white mineral particles (pumice), and occasionally some 

 small pieces of a red mineral ; a few Eadiolarian remains and man- 

 ganese grains. 

 The dredge on the 21st July contained much mud, in which were a few 

 manganese nodules, about a dozen sharks' teeth, some with a coating of 

 manganese, and one or two pieces of pumicestone. 



Sounding 280. 26th July, 1875. 2225 fathoms. Lat. 23° 3' N., long. 

 156° 6' "W. A red clay containing : — Much amorphous clayey matter; 

 many fine and some rather coarse mineral particles (pumice and red, 

 black, and yellow minerals); a few Eadiolaria and Cliallengeria 

 remains ; a few manganese grains. 



Sounding 281. 27th July, 1875. 310 fathoms. Of Oahu, Sandwich 

 Islands. Some traces of volcanic sand and coral debris on the dredge. 



Honolulu to Tahiti. 



Honolulu, August 1875. 4 to 16 fathoms. Inside the reefs. A blue mud 

 containing :— Much amorphous matter ; many fine mineral particles, 

 the debris of volcanic rocks ; a few Poraminifera and debris of coral. 



Outside the reefs. 20 to 40 fathoms. A coral-sand containing : — Debris 

 of coral, Polyzoa and Foraruinifera, surface shells, &c. ; a few black 

 sandy particles. 



Sounding 



;275. 



17th July, ] 



.875. 



55 



276. 



19th „ 



55 



55 



277. 



21st „ 



55 



5"5 



278. 



23rd „ 



55 



55 



279. 



24th „ 



55 



