22-t Scientific Intelligence. 



should be termed Pteropod and Globigerina oozes, though differ- 

 ing from these oozes of the open ocean in the size and nature of 

 the mineral particles. 



The siliceous organisms never make up more than 4 or 5 

 per cent of the whole, and consist of Radiolarians and Sponge- 

 spicules with a few Diatoms. Off the Barbadoes in 221 fathoms 

 w T as obtained a calcareous concretion two inches in diameter ; it 

 was formed about shells of Foraminifera, etc., each acting as a 

 separate center. Off Northern San Domingo, in 772 fathoms 

 (4632 ft.) small manganese nodules (the largest 2 in. in diameter) 

 were obtained, the interior of which consisted of cemented pelagic 

 Foraminifera ; they resembled nodules dredged by the " Challen- 

 ger" in 1525 fathoms near the Cape Verdes. 



In the Old Bahama Channel, at a depth of 438 fathoms 

 (2628 ft.), the bottom was a Pteropod ooze or white coral mud ; 

 87*06 per cent, were calcareous, consisting of shells of Gastero- 

 pods, Lamellibranchs, Pteropods and Heteropods, Ostracoids, 

 calcareous Algae, Bryozoans, fragments of Echinoderms, Alcyo- 

 nium spicules, coccoliths, Rhabdoliths, and about thirty species 

 of Foraminifera. Three per cent were siliceous organisms, 6 '94 

 per cent argillaceous, 12*94 mineral grains. 



West of Navassa Bank, at a depth of 1050 fathoms (6300 ft.), 

 the bottom (temp. 39^° F.) was a Globegerina ooze, 62*38 per 

 cent being calcareous, and mostly made up of Foraminifera, with 

 shells of Lamellibranchs, Pteropods, Heteropods, Coccoliths and 

 Rhabdoliths, four per cent consisted of siliceous organisms. 



Off Porto Rico, in 874 fathoms, (5244 ft.), the bottom was a 

 coral or Pteropod ooze, 70*66 per cent being calcareous, and 

 seven per cent of siliceous organisms. No coral fragments are 

 mentioned as having been found. 



Off Santa Cruz, depth 2375 fathoms (14,250 ft.), the bottom 

 was a Globigerina ooze, 6354 per cent being calcareous; 11*46 

 argillaceous ; mineral grains (including fragments of mica schists 

 3 to 5 mm in diameter, feldspars, quartz, mica, hornblende, magne- 

 tite) ; and five per cent siliceous spicules of sponges. 



Off Dominica, depth 1131 fathoms (6786 ft.), the deposit was 

 a volcanic mud, with 13*78 per cent calcareous material and con- 

 sisting of Pteropods, Echinoderm fragments, Coccoliths and Fora- 

 minifera. Off Martinique, in 1224 fathoms (7344 ft.), the bottom 

 was a volcanic mud, of which 13*41 were calcareous and included 

 Otoliths of fishes, Pteropods, fragments of Echinoderms, Cocco- 

 liths and Foraminifera (20 species), and three per cent siliceous 

 organisms. Off Grenadines, in 163 fathoms (998 ft.), a yellowish 

 brown Pteropod ooze was dredged, with 76*20 percent calcareous 

 and containing 30 species of Foraminifera*. Off Barbadoes, in 218 

 fathoms (1308 ft.), the bottom (temperature 52^-° F.) was a Ptero- 

 pod ooze or Foraminiferal sand, 38*09 per cent calcareous, and 

 25 per cent siliceous (many Sponge spicules with a few Diatoms 

 and one or two Radiolarians, and glauconite). 



(4.) Gulf of Mexico and Florida Straits. — Under 100 fathoms, 



